Guys, Why does he keep asking me if I like him?

There's a guy I have a thing with, we're in between the friendship/dating phase, and he always asks me why do I like him, and how he doesn't deserve me. I'm 23, and he's 19, he keeps asking me if I were 17 would you still like me? Why does he keep asking me these questions?
Guys, Why does he keep asking me if I like him?
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