I think when creativity split it was more like Roman got ripped from Remus more than anything, from what we know Creativity got split because of what Thomas believed to be good and bad and as such Roman is the one most stuck on this black and white thinking because that's what he is. He is the result of that.

As for how creativity split I like to belive that King Creativity was locked in a room by the Mind Palace or the Unconscious (i kind of view it as this eldritch horror thing that carrys out Thomas' unconscious wishes, also having it as the Mind Palace means more angst of Roman feeling jusy completely unsafe). This is also why Roman is so on edge in the SvS episode - because he remembers the split and being formed. He also knows that between the two of him Remus is supposed to be creativity, not him (which makes sense as Romulus and Remus are the twins in actual Roman mythology). So anytime he seems to do something 'bad' or 'wrong' there's a chance whoever split them (Be it the Mind Palace or the Unconscious) might come back and 'fix him' until he's Thomas' ideal version of 'Good' Creativity. I also kinda like the idea that this has happened shortly after the split, like Roman controlled impulsive thoughts or something but that was deemed wrong and so was taken from him and given to Remus.

Anyways, this all leads up to Roman being locked up by the entity (once again The Unconscious or the Mind Palace) and whilst Thomas' creativity is still functioning they can't summon him so they do a whole adventure to his room which oops they can't enter cause its under 'maintenance' they can hear Roman though and the poor boy is sobbing amd apologising for not being good.

Insert whole Philosophy debate about defining things as good and bad and accepting Remus as Creativity, and not being inherently bad but also still having a boundary separating creating art that is disturbing to you and art that isn't (because tbh Roman and Remus have been separated for so long is would impossible for Thomas to consider them as one thing anymore so they will never merge).

The door then unlocks, and everyone rushes in and finds Roman, still sobbing and curled up and Remus tackles him into a hug and they have a long crying session and he appologises to Janus for making fun of his name and placing so much pressure on Pattons and for ignoring Logan and initially not wanting Virgil to be with them and labeling Remus as inherently Evil (the damage by the entity is done so hes free from the black and white thinking but now stuck beliving he has always been in the wrong, so like borderline hysterical at this point).

The others are obviously all thrown off and so the whole story is spilled, Roman telling most of it as Remus wasn't entirely aware of the whole situation (they both remembered the Kings memories but Remus physically remembers physically being the King and making choices but didnt realise Roman didnt). Lots more tears and appologies and the other sides being servery disturbed and incredibly concerned by the whole situation. But they all make up and Thomas is sent off to bed whilst the rest of them have a movie night.

(Where Roman second guesses his choice to send Thomas to the wedding and finds comfort in the only one who saw his side; Deceit.)

"Like I said- everything has a purpose. And you're denying yours. You want that callback SO. BAD. And it will /crush you/ if we miss it."

The words echo in Roman's head as he sits on his bed, arms wrapped tightly around a pillow, cheeks stained with tears. He made his choice; Thomas was going to the wedding. It was morally right.

Then why did everything feel so wrong?

It had felt better at the time; Deceit was furious, but the proud looks on Virgil and Patton's faces had been nothing short of reassuring. He wanted to believe that he'd done what was best, but deep down… god, how could he have thrown away that opportunity?

The walls of his room, normally his safe haven, feel more like a prison now. His whiteboard is empty, blank pages surrounding him as if reminding him that he's lost out on one of the biggest opportunities of Thomas's life. He needs to get out.

Sinking down, he finds himself in a new room, a blank slate for creating. What he makes is simple enough; an auditorium with a large, bright stage. He walks across the wood, each step leaving an echo in its wake until he reaches the edge and just… sits.

Being onstage helps, even if he doesn't have an audience or material.

"I thought I might find you here."

The sudden voice makes Roman jump, turning to see Deceit watching him with a curious expression. Normally his mere presence would be enough to make the creative side uneasy, but today…

Well, Deceit was the only one who saw his side.

"Yeah." Shrugs in an almost defeated manner, patting the spot next to him. Dee takes it.

They sit in silence for a few moments before Deceit speaks, and though his words are about what Roman expected, the almost soft tone surprises him.

"Why did you do it?"

There's a pause before he replies, trying to stop a fresh wave of tears from falling. "I… thought I was doing the right thing…"

"Don't lie to me." His voice is still soft. "You know it wasn't the right choice. Yet you still made it."

"I know." Shuddering sigh. "I know. Fuck, I know. He deserved that callback."

"He did, yes, but that's not the point. Thomas knows that he's going to the wedding to look like a good friend. But why did you choose to send him there?"

Realization dawns on Roman, the next words escaping his lips before he can stop them.

"Because I wanted the others to be proud of me."

Dee half smiles, though the usual smugness isn't quite as prominent. "There it is. You and Thomas, shoving yourselves into a corner and putting yourselves last. It's quite sad, really."

Panic spreads through Roman's being as he realizes just how true it is. "He could have explained it. He could have done /anything/ and still gone to the callback. And yet I sent him to the wedding-"

"If only you could have seen this in the courtroom."

A choked sob fills the air as Roman buries his face in his hands, trying to keep himself together but ultimately failing. He's the problem here. He did this, all of this.

/He's/ the reason Thomas lost the opportunity of a lifetime.

"Roman."

A few seconds pass before he lifts his head, surprised to see Dee mere inches from his face. The dark side reaches out to brush the hair from his eyes before gently cupping his chin, his voice soft yet steady.

"They don't appreciate you. None of them, not in the way you deserve to be appreciated." Tilts his head. "They don't see what I do. They don't see the boy who's alone, desperate for love yet terrified to ask for it. What was it again that you called yourself? The one and lonely?"

Roman flushes at that, eyes trained on that handsome face. Up close, Dee didn't seem anywhere near as frightening. "I didn't think anyone heard me…"

"I did. And I saw you. I saw the pain in your eyes when Patton berated you for wanting to go to the callback. I saw the frustration when Virgil got mad at you for agreeing with me. I saw the ache you felt when I called you out for what you really wanted."

Each word hits Roman harder than the one before, and he knows Deceit is right. Nobody saw him, his frustration, his pain. They never did.

Nobody except Deceit.

"I try… I try so hard." His voice is shaky as he leans into the touch, shifting closer to the other. "But it doesn't matter to anyone…"

"I said it before, you're not appreciated by them. But you are by me."

With that, Deceit closes the distance between them, everything inside Roman heating up as their lips connect.

The kiss is slow and gentle at first. Dee takes control soon after, tongue darting out to part Roman's lips, and soon the prince is melting against him, fingers gripping the edges of Dee's coat to pull him closer. He can't help but groan softly into the kiss, heart slamming against his ribcage.