Why does he act uninterested?

The guy I like, I know from common friends, is someone who loves to meet and talk to new people both guys and girls.

He has dated a few girls casually in the past but has never been in a serious relationship, and I dont know if he's even looking for one.

But I know for once that I'm much better than the girls he casually dated in the past in the sense I have a lot in common with him and I think we'll get along really well. But somehow, everytime I try talking (only through call/texts, we've never met), he seems closed off, hot and cold and almost disinterested.

Why can't he talk/get to know me like he does with other people (not just with girls or in romantic sense but he loves connecting with people in general)? Even casually?
Why does he act uninterested?
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