This girls behavior is driving me nuts, why would she be so hot and cold?

So I’m talking to this girl. I really like her, but she has a boyfriend. Well long story short, we have kissed a couple times, she gave me head too. Now I know that’s terrible cause I know she has a man but I think I might be in love.

So when I ask her out she on a text she never responds, but later that day watched my Instagram story like nothing happened. Why would she keep interacting but then never want to go out on a date. Just hook up at a friends place or party.

I love the hook up part, but it’s killing me that I can’t date her.
This girls behavior is driving me nuts, why would she be so hot and cold?
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