Here is a quick version of the story:
I met this girl 6 months ago. We had all our graduate classes together etc. We began hanging out a lot, I asked her out she rejected me. I continued to be her "best friend" (very BETA). Then in December I escalated and we fooled around, etc., we slept over at each others places (no sex), and when we were drunk I kissed her 2 times, I also committed a major mistake and revealed my feelings. Meanwhile she made out with 3 other guys and hooked up with one guy on a first date.
In January I went NC for two weeks after ending our relationship by making out with her. We began to talk again after that but I began to act ALPHA, negging her, flirting, pursuing other girls. We got closer than ever after that, we held hands numerous times, cuddled, and I went back to fooling around. Then last Wednesday, I kinoed her and then escalated and she let me have the opportunity to F-Close. However, I could not F-close because of performance anxiety.
Problem: While she seemed very interested in me during the weekend (texting me pics, saying she loves me), come Sunday she began acting different. She hasn't texted me, although on Monday we kissed in school (she left a book in my car so I teased her with it until we kissed). Our interactions have also been lacking compared to how they were when we were "best/close friends."
Question: I want her to be my gf but I don't know how to proceed. After the sexual encounter I feel like she has me in the palm of her hands. I've been worried about other guys that are also pursuing here. (Slipping back into BETA attitude) Why is she being distant, how can I get her to chase me again.