Why does the guy I had a crush on years ago keep liking & matching with me?

I had a crush on a guy years ago and we talked for like a min but nothing ever came of it. We are friends on social and recently I've been on dating apps and he has liked me and matched with me multiple times but when I message him.. he never responds. I'm starting to think I'm just a back up girl or he's playing with me for no reason at all.

Why does the guy I had a crush on years ago keep liking & matching with me?
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