Why does she keep teasing me if she isn't in to me?

I had a crush on this woman I know for a while and for a bit I thought she liked me but she I recently overheard her talking about me to some other women and among the things she said one was "I'm not going to have sex with him" which is something I never expected to her though I'd obviously be down for it if she was. She has and continues to make sexual remarks around me which she always says loudly and it's often jokingly but why would you do that around someone you think likes you and you don't share the same feelings for them? Again she continues to do these things. Just a couple hours ago I was by myself in the kitchen and she walks in and randomly makes a orgasm noise and then stares at me. I catch her looking at my butt and crotch a lot which flattered me at first but now it just confuses me. She'll passive aggressively make comments about me that are sexual in nature when I'm in hearing range as well. She kind of codes it but I know it's about me due to how specific it is. With all the stuff she does how could I not get the wrong idea? Then she turns around and talks kind of negatively about me behind my back? What is her problem? I'm trying to stay cool with her but I'm beginning to feel anger towards her because of this.