…and one day, you’re gonna wake up and realize that "I don’t love him anymore."
You want to talk about what his dad did?
I don’t think, as a caveat and disclaimer, that Blaine’s dad ever did wake up and not love Blaine anymore. But Blaine’s perception is what we have, and what matters. Blaine believes his dad tried to make him straight. He was, maybe, 13. To him, it was a kind of rejection, and he’s been dealing with it silently for six years, nearly. For Blaine, there’s a very real chance that people will one day realise that he’s not what they want, or expect, or love.
And then they’ll leave him.
Not to mention…that’s pretty much exactly what happened to him when it came to his friends. We have no indication he’s still in touch with people from his first school. (He straight out said he didn’t think anyone cared about his issues there). The Warblers who he thought were his friends turned on him and sent him to the hospital. He hung out with the seniors of New Directions when he transferred and well we all remember how he felt at the beginning of his senior year.