No need to tell me, but apparently we do need to tell it to the "writer" who wrote it. Somebody sat down, took a character with Astarion's story arc, and decided that it would be hilarious to watch a recovering abuse victim have their hopes crushed and run away in pain while nobody cares. And just in case you disagree, the game takes all control away from you so you don't ruin the joke by trying to make sure he's fine or disagreeing with the other companions when they make their dumb, useless comments.
This is a video game forum so i don't want to get into what this kind of writing tells people who see themselves in Astarion. And there's unfortunately plenty of them, as Neil keeps mentioning.
The first time I saw it, I broke out in tears. I'm one of those people who relate to Astarion because of my own past and to watch that scene was incredibly painful. If the message is supposed to be: 'no matter, how hard you try or what you do, you're always going to be a joke', they succeeded.