What should I do if my crush (who says he like me a lot) is emotionally unavailable?

We've known each other for years but recently started to flirt with each other. Its been going well and we are together as if we were in a relationship but when asked about how he feels about us, he says really likes me but he doesn't love himself enough to love someone romantically... so I'm unsure how to go forward.

What should I do if my crush (who says he like me a lot) is emotionally unavailable?
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