Does my crush really like me or is he just desperate?

My crush expressed his interest in me after he found out that I used to like him. Now he seems to be obsessed with the idea of dating me according to mutual friends and flirts with me pretty aggressively. I don't understand why he suddenly feels this way because I'm pretty sure he didn't find me attractive in the past. Could he only be desperate for affection and sex?

Does my crush really like me or is he just desperate?
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