I had this female classmate that I studied with.
Last month, I caught her drawing a huge dick on the whiteboard. I asked her if she was horny, but she said she had a boyfriend. I told her he didn't have to know, but she still said no.
She kept studying with me, so I kept talking dirty to her. A week later, she was single and dtf. So I fucked her a few times. Suddenly, she started acting funny. She says stuff like "I shouldn't do this. I'm not sure if I like you." I keep telling her to go with the flow. She's really good at sex. I asked if she was stopping to get another guy so she answered that she once slept with one who wasn't interested in a relationship.
I keep having to persuade her to hang out, but when we get together she tells me all these secrets about herself and puts out. What's wrong with her?

EDIT: Her bf was long distance. They didn't have much sex, so she was horny af.