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Prepare for excessive Seblaine feels
Weep Little Lion Man, You're not as brave as you were at the start Rate yourself and rake yourself, Take all the courage you have left
So me and Louise had this giant headcanon about how maybe Sebastian would push Blaine a little too far one day, maybe they'd kiss, only once, but once is enough, it's enough for Kurt to break up with Blaine. And then, finally, when Sebastian sees Blaine empty and hurt and just broken, he'll understand.
He'll understand that what Blaine and Kurt had was a real, tangible thing, with that feeling of I will crumble without you and that it isn't just a game. But what he'll also understand is that Sebastian himself has the same kinds of feelings for Blaine. Because when he sees Blaine suffer, he's not happy because him and Kurt have broken up, he's not rejoicing because it's easier for him to get laid. Seeing Blaine like that, it hurts him too and that's when he realizes, way too late in the game, that he has the same feelings for Blaine that Kurt and Blaine had for each other.
But it was not your fault but mine And it was your heart on the line I really fucked it up this time Didn't I, my dear?
So he sings this song to Blaine, this song which is just perfect because it conveys all the raw pain and sorrow that Blaine is feeling, and that Sebastian is experiencing through him. And it's Sebastian finally putting his own feelings on the line, and asking him to please, please give him just this one more chance.