He never texts first, but always replies. Possible reasons?

A friend said to me that, if this guy wasn't interested or found me annoying, he wouldn't even reply.

He's in the same town, but different college, so I don't see him on a daily/weekly basis. We hung out a lot for like six months, but now we just..don't.

I text him every couple of weeks just to check if he's still alive or invite him to a party/coffee/beer, but he never comes.

So I don't think I'm annoying, on the contrary - it's quite possible he thinks I only like him as a friend and he might have given up on me. I obviously like him more than just a friend, but I like a guy to become my friend first and then a boyfriend.

It's a short version of a long story, but what could be possible reasons for this kind of situation?

Thank you
He never texts first, but always replies. Possible reasons?
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