I think the film represents it as all of those things. Benny doesn't want to check Joon into a hospital because he doesn't want to abandon her; each is the only family the other has left. He think it's better for her to be with him than with orderlies who don't know and love her and just treat her as a patient. And of course he feels responsible for Joon and knows he could never forgive himself if something happened to her (or she did something) when he wasn't there to watch her.
Those all play a factor in why he's reluctant to let her move in with Sam, but there is also a part of him that, to paraphrase Joon, "needs" her to be sick. Caring for her gives him a definite sense of purpose; he's been doing it his whole life. He knows it. Even the chaos of his life caring for a mentally ill sibling is preferable to the thought of a life that is suddenly without a clear sense of action. His identity has become wrapped up in his role as caregiver. Without Joon to watch over, who is he? What does he stand for? He'll have to invent his life from the ground up, which is a scary prospect. That doesn't mean there's no selflessness and love in his choice, but it isn't entirely altruistic, either. Human beings are selfish, even in our acts of goodness, and some aspect of his own act was a selfish one.
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