Why is he like that?

So im almost sure this guy likes me, he more quiet around me than other people, and i catch him looking at me a lot. But he doesn't talk to me first. Its kinda annoying when he comes near me, but just looks at me and thats it. If i dont say something then he just walks away after a while. And he had multiple gfs, and a grown man, not teen boy.

So i stopped talking first to him, wait and see if he can bring up something, and do something other than looking at me. But he just became more distant with me, and i noticed he doesn't even look at me on purpose. Like he walking straight next to me and ignoring me.

Why is that?

Why is he like that?
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