#because he incorrectly believes that kurt's love for him won't last

[thnxforknowingme]

just thinking about how Blaine Anderson so desperately craves love and attention and validation from other people. And in Kurt, he finally finds someone who loves him in a way no one else ever has. But Kurt, at the start of S3, isn't Blaine's whole life - he still has his friends at Dalton, and this is the excuse he gives when Kurt asks him to transfer. I don't think Kurt is to blame for this - he's a myopic teenager with only the best intentions. He loves his boyfriend and wants to spend more time with him than going to school so far apart allows (not that glee has ever paid attention to real-world geography, but whatever). But from Blaine's perspective, his boyfriend is asking him to choose - Dalton, or me? The Warblers, or me? It's not an ultimatum by any means, but maybe Blaine worries it could someday become one.

So he leaves behind the school where he finally found a home, where he was given so much attention and admiration, where he felt not just accepted but venerated. He tells Kurt, "I'm doing this for me, because I can't stand to be apart from the person I love." And that's true - he's doing it for himself because for maybe the first time in his life he's someone's top priority, and he can't stand the idea of letting that slip through his fingers.

And then, a few months later, the Warblers utterly betray him. What starts out as pretty standard overdramatic show choir rivalry turns violent. We don't know, ultimately, how many of the Warblers knew exactly what Sebastian's plan was - did he tell anyone else about the rock salt? - but what we do know is that Blaine's former teammates and friends saw him lying on the ground, crying out in pain, and they walked away from him.

This only reinforces Blaine's idea that others, even those he cares about, will either hurt him or leave him - he'd tried being nice to Sebastian, maintaining that connection to Dalton and the Warblers, and this is what he gets in return. He's pushed away from the social bonds he built at Dalton, and Kurt becomes even more the focus of his life.

So then we have DWS, and the lead-up to it - Blaine realizes that Kurt will soon be leaving him, in distance if not in affection, and he doesn't know how to cope with the fact that he's built his life on a shaky foundation. He pulls away, and that makes Kurt feels awful, and that makes Kurt seek attention elsewhere, and it all goes to shit. Kurt continues to reassure him throughout S3 that they won't fall apart, that even over a distance their relationship will be strong. But then when Kurt is in New York, he's busy. And it's not just the lack of time or physical closeness - it's the fact that Kurt is building an adult life, he's making new connections with others and prioritizing his own growth. Blaine is not the center of his world - but he is absolutely the center of Blaine's. Blaine once again feels that someone else's love for him is conditional, that when it becomes inconvenient for someone else, they will always abandon him. He changed his whole life to chase after Kurt's attention and love - Kurt won't do the same for him (because Kurt has a much healthier attitude towards relationships and love in general).

So Blaine, a lonely and panicked myopic teenager, seeks attention elsewhere.