"Yeah, that guy!" Magnus snaps his fingers. "My cousin's boyfriend met him once. Total asshole IRL, apparently. Which I guess you could have guessed, from all the atrocities. But my point is -- it's not that the work would be undone, it's just that you never know when that rock is going to roll back, with depression. It comes in episodes. And no matter how much you love someone, if you wrap all of yourself up into trying to make them get better, or keeping, like, vigilant for their suffering so that you can immediately swoop in and try to improve their situation... you're going to get frustrated when it doesn't work, or doesn't follow a predictable path. Even if you're committed to not getting frustrated. Because you're also going to get burnt out. And that doesn't serve either of you, you know?"