Why is this guy sticking around?

We're not close at all we just happen to know each other because of life circumstances, he has my number because reasons. Sometimes he texts me even though he doesn't write much and he constantly watches my stories, if I post something 2 minutes later or even less I see his view. I don't care about him, I'm annoyed by him and I don't understand why he's just hanging around and it seems like he just watches my life. Also he has a girlfriend, I hope this doesn't mean he's interested in some way? I don't want to send him wrong signals.

Why is this guy sticking around?
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