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Aang, and a lot of KA shippers, seem to interpret letting Katara go as no longer loving Katara. However, as Aang himself points out “three chakras ago love was a good thing”, so we know that love itself isn’t the problem.

Let’s look at how the guru says that love is a good thing.

When unlocking the 4th chakra, we’re told that this chakra deals with love and is blocked by grief. We’re not told that Aang should not love the Air Nomads. We’re told he needs to let go of his grief about their being gone and see that their love is still in the world. We then see Katara’s face, showing that it is her love for Aang which is helping Aang recover from the grief of his loss.

This perfectly connects to the way we’ve seen Aang lose control of the Avatar state. In The Southern Air Temple, Aang loses control because of his grief at their loss.

We see in that same episode that Aang’s realisation that he still has people who can be part of his family is what helps Aang come out of the Avatar State.

The guru isn’t saying that Aang shouldn’t love the Air Nomads. He’s saying Aang needs to be able to carry on in the face of their loss, and be open to new love.

But the loss of the Air Nomads isn’t the only thing to trigger an emotional Avatar State from Aang. We see this again in The Avatar State when General Fong buries Katara.

In order to be able to control the Avatar State, Aang needs to be able to deal with the potential loss of Katara.

But it’s not only the potential loss of Katara’s life that Aang needs to deal with, it’s also the potential loss of her as a romantic prospect.

In The Ember Island Players, Aang tells Katara that if his chakra wasn’t blocked he’d probably be in the Avatar state because of an on stage depiction of Katara and Zuko in a romantic setting.

We are told in canon that Aang is so attached to the idea of his relationship with Katara that it causes him to be unable to control his emotions, and therefore the Avatar state. That’s not healthy, with or without implications about his ability to save the world.

So, what’s the solution? It’s clearly not that Aang cannot love Katara. We know of multiple previous Avatars who fell in love and had happy relationships.

I think that when the guru tells Aang that he needs to let Katara go, that doesn’t mean he needs to stop loving her. It means, as with the Air Nomads, he needs to be able to find peace with the idea of a life without her. He can want her to live, and fight for that with all his might, but if she dies he needs to be able to keep going. He can want to be with Katara, but he needs to be able to accept it if that’s not what she wants.

aang having to let go of katara isn’t — in fact, logically cannot be — about having to let go of love, because there is no mention of having to do the same for sokka, toph, appa or momo. and even if we make the caveat that pathik was referring only to romantic love, it still can’t be true because we know that previous avatars have loved and been loved romantically without issue. roku, kyoshi and kuruk all had romantic partners, so there is no reason aang cannot. then it follows that aang needing to let go of katara specifically can only be because what he feels for her is not love — true, pure, selfless love — but attachment. aang’s choice isn’t actually for katara at all; it’s a choice for himself, because he doesn’t want to let go of her.

there’s a reason that aang’s grief over the air nomads gets brought up in this same episode, because it is inextricably intertwined with both his feelings for katara and his role as the avatar. after all, it was his being the avatar that led to the fire nation’s attack; it was his abandonment of that role out of fear that caused him to survive instead of being slaughtered with the rest of his people. the weight of his responsibility, and his failure to meet it, is the weight of his grief, and he cannot accept the former without coming to terms with the latter. this is a large part of why aang has latched onto katara, as a crutch to avoid having to face not only the reality of his loss, but the reality of who he is, and why he has to let her go in order to master the avatar state, the embodiment of what he once ran from.

the narrative framing of the guru episode makes it clear that the audience is meant to view aang’s choice as the wrong one. there’s pathik’s ominous warning — aang intentionally concealing the truth about not having mastered the avatar state from toph and sokka — and even iroh’s advice about choosing love over power (which gets thrown around a lot to defend the narrative dropping this plotline later on) is notably given without iroh being aware of the actual nuance of aang’s situation. with knowledge of the full context, it’s highly likely that iroh (a proponent of meeting your destiny on your own terms) would have said something entirely different.

it’s also narratively inaccurate to attribute the choice of the avatar state to being the choice of power, just as it is to attribute the choice of katara to that of love. within aang’s arc and the set up of his character, the avatar state does not represent power but actualization: the manifestation of who he truly is, and must become. it’s the equivalent of aragorn taking up the crown of gondor, simba returning to pride rock — a staple of the classic hero’s journey, where the protagonist fulfills his goal by facing what he does not want to face and accepting who the story needs him to be. if we apply the Want vs Need paradigm here, then katara is the Want while the avatar state is the Need.

the same arc is mirrored with zuko in the book 2 finale, drawing upon the two characters’ relationships as narrative foils. both zuko and aang choose wrong — choose the Want — and pay the price. then comes sozin’s comet and the agni kai, and the conflict of love vs power returns again with katara as its lynchpin — but this time, when zuko leaps in front of azula’s lightning, we know it’s the right choice because the story has established the choice of katara as the Need, as the completion of zuko’s actualization as a character. in aang’s arc, the choice of katara represents divergence, leading him further away from his destiny; in zuko’s arc, it’s a convergence, the re-alignment of who he was with who he’s destined to be.