one aspect of Ruben's attack on Alby that i think is really interesting is Niall's pretty significant part in setting it up. And how this is really reflective of everyone sort talking past each other in pursuit of executing their own performances.
and just to clarify going in: none of this means i think Niall set it up intentionally, i don't think Ruben is simply being a good bro, and none of this justifies the attack itself.
so i do think Ruben had a much different motive than what I've mostly seen ascribed to homophobic/jealous reactivity at the implication of Niall's romantic connection to Alby and to their enmeshment (the "you think that's better?" line). but i actually don't think homophobia/jealousy truly entered into the equation all that much in this instant, and i don't really think he picked up on it in a particularly noteworthy way here. it's present and underpinning the whole show, of course, but here i think it distracts from what was going through Ruben's mind in this moment which i think goes back to that first phone call.
remember that Niall calls him in tears, implies that some guy named Alby was responsible, and that Niall needed him to come visit? now, having watched what actually happened, we the audience know that Niall is ashamed, not victimized. he drank too much and peed himself in front of someone he perceived as superior and admirable (and desirable), and from whom he wanted approval and acceptance, and as far as he knew, also in front of the girls whose approval and acceptance he also wanted. add to this shame Alby's note--which imo was objectively fine but, read by someone in a highly reactive, highly sensitive to rejection state of mind, can be interpreted as a bit too mocking and crushing any chance of being liked by (or desired in turn by) this guy he likes. so we see Niall physically panic and break down, hence the emergency 'i need you' phone call to Ruben.
But. BUT. at no point do we see Niall explain any of this to Ruben. Ruben has no idea Alby simply took care of Niall when he got sloppy drunk, he has no idea Niall was calling him in shame, and not as the result of being bullied by some kid named Alby. just like Niall was bullied in high school. just like the bullying Ruben stepped in and stopped at Niall's behest. because Niall never clarified the call, Ruben arrives primed to see Alby as a threat to Niall and primed to be Niall's protector--which by his definition of protector, means he's primed for violence. you see this mentality at his cold greeting and posturing to Alby--that's not simply jealousy of another man being in Niall's life--and you see it as one of the first things he does with Niall. this is to spar with him out front, refreshing his self-defense skills and also trying to present Niall, himself, as someone not worth the risk of bullying--the sparring is a performance, and one meant to establish Niall's masculinity as much as his own, but, importantly, not above his own, and absolutely not without his permission.
so this continues on in various ways--drugs, womanizing, squaring up to strangers, generally being a dick to Alby--when this all comes to a head.
Niall convinces Ruben to apologize--something that, in the realm of toxic masculinity, means some level of submission on Ruben's part--and he does this without ever having truly clarified about that phone call, and without coming out to him (which, side note, i thought was a perfectly valid decision), thereby re-contextualizing Niall's evident spike in distress ever since. Ruben goes into this conversation with Alby, in Ruben's eyes, completely overreacting and making a big deal out his apology (his submission) all while Niall is increasingly, visibly panicked and scared. and then Niall's reactivity turns towards Alby--you know, Alby the 'bully'--and Niall (lightly, but significantly for him) physically assaults Alby to stop him from saying something out of evident fear, which results in Alby pushing Niall away, inadvertently injuring Niall in the process (Alby wanted him away, not hurt). and then Ruben, of course, completely loses it and viciously attacks Alby, not just in excess to what was actually going on, but in excess of what he incorrectly believed was going on. what he was led to believe was going on due to Niall's intentional and unintentional framing of his and Alby's dynamic.
and this is just another continuation of the episode's theme of all of these characters talking past one another, carrying out their performances of who they want to be, of the lives they want to live, either ignoring or not knowing who they actually are. all five of them view themselves as the main characters of narratives that don't reflect reality.
Ruben is playing the bodyguard role and the 'love em and leave em' charming rake. except, no, he very much isn't because Niall doesn't actually need a protector in this situation and no, he's not charming, he's just a misogynistic asshole.
meanwhile, Celeste thinks she's starring in a story about sexual awakening and being the one woman sex guru for a sweet innocent repressed virgin 'porridge man' who just needs to follow her lead to reach self-realization and happiness. She has the power to improve and transform the people around her, she is the cool one, the confident one, the hot one. But this is very much not the case. She has no power, sexual or otherwise, over Niall, she doesn't even have it over Ruben. none of them even really see her as cool except for Niall, who mostly has eyes for Alby and Ruben. yes he wants her approval, but not because he sees her, only because he sees her front and wants to meet it with his own and be perceived as straight. it has nothing to do with her specifically.
and then you have Joanna, who thinks she's in a friends style sitcom where she and all her flatmates are going to automatically be a nice neat little family. which is just an entirely unrealistic expectation to have and unreasonable standard to hold people to. she thinks that Celeste, this woman she literally just met, is already her girl bestie whose loyalty she can rely on. but this isn't true in the slightest, Celeste immediately makes out with Ruben despite his and Joanna's quickly established 'thing' and doesn't hesitate to continue even when Joanna is overtly prompting them to stop doing it in front of her. Celeste even tells Ruben and Niall that Joanna was off peeing in a bush despite that information being completely unnecessary for them to know and despite it being something that Joanna would clearly not want them to know. and these girl code BFFs don't have their cute boy and his bad boy brother built in BFs either, with Niall being unresponsive and quick to abandon them both for Alby and with Ruben being a womanizing dick by flip-flopping between them and literally spitting in her face. even Alby isn't interested in being the fun GBF, either, nor is he particularly prone to participating in their friends group in general with his tendency to more hang out on the sidelines and around Niall.
and Alby. oh Alby. Alby thinks he's in a narrative about drawing out poor Niall from the closet, about showing this endearing guy what being out and proud can really mean for your confidence and sense of self. about how being true to yourself doesn't just mean being out, it means leaving those who look down on you for it behind and freeing yourself from the hold they have on you. about how it gives you a strength to withstand and overcome the hatred, even when that hatred is expressed physically. but this isn't the the whole story. no, Niall isn't ready to come out of the closet, and no, your confidence and self love isn't always going to protect you. he isn't even the benevolent guide and inspiration he wants to be as, instead of abandoning this role and pulling back to fit his own boundaries when Niall is unwilling to participate at his desired pacing, Alby opts for trampling Niall's boundaries and attempts to out him to his violent, unpredictable brother. despite him only knowing these people for a matter of days, despite that never being his choice to make or his risk to take. it is a truly horrible thing for him to do, or rather, attempt to do (but he still didn't deserve to be attacked like that)
Niall, for his part, is frantically trying on all these different narratives himself, desperate to find a niche for himself that will fit in. is he a late bloomer coaxed out by Celeste? is he the straight nice guy friend in Joanna's sitcom? is he the gay guy who's about to walk out of that closet and have everything be okay with his super hot considerate BF? he doesn't know, only that he definitely has a role as Ruben's brother, no matter how fucked up that role may be. so he uses that role to hit the eject button on the other narratives whenever they become stressful or inconvenient, no matter how he jerks around the others' emotions and investments in him.
and note that every single one of them EXCEPT FOR ALBY abandons the story lines they were trying to make happen: Celeste ditches her sexual awakening guide narrative with Niall pretty quickly and opts for fun with Ruben, Joanna has enough of their bullshit and kicks them out dead-voiced, friends sitcom be damned, and Ruben ends his 'protector' story by physically injuring Niall and overtly threatening him via finger guns as he's shoved into the police car. Niall bails on all his narrative attempts, and he even loses/abandons his ever-present, ever-reliable role as Ruben's brother from another lover by the end.
in an interesting way, Alby's and Celeste's attempted narratives are very similar--the roles they see themselves taking in Niall's life--it's just that Alby has more care and insight into Niall as a person than as an npc, and this makes him far more invested in the outcome of his story. this encourages him to stick with it even when he should so clearly abandon it for all of their sakes. Celeste bounces from hers early -- Niall is giving her nothing and she's not particularly attached to her narrative role -- and is the only one to avoid being too hurt by anything that happens. in contrast, the others stick with theirs too long, too hard, too much and end up varying degrees of hurt. Joanna more than Celeste, Ruben and Niall more than Joanna, and Alby most of all.