Girl's Behavior

Why is she pissed off at me?

So she’s stopped talking to me and I ask her what’s up is there something wrong why aren’t you talking to me, she says nothing is wrong. So I just ignore it and act normal with her then she won’t even notice me on purpose now. I try to talk to her and say hi but she blows me off. The next few days I catch her looking at me and trying to make me jealous with this guy, so it started to really piss me off because I don’t know why she’s stopped talking to me but then tries to get me jealous? Anyway I’ve gone ice cold now and don’t even pay attention to her as if she doesn’t exist. But now I can tell she’s really annoyed with me, pissed off. And she tries to talk to me but I still ignore her or say a short response back, but she looks sad and upset. It’s like all these emotions she’s showing and I don’t get it.

Why is she pissed off at me?
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