There is a woman in my class who I have been flirting with back and forth. Originally she began sitting down next to me and we began flirting for a week or so with a lot of eye contact and smiling. On monday she suggested I come over to her apartment to "study together." I took this a signal for a hook-up. We walked outside of class and I suggested we should go out for coffee on the weekend. She agreed and said we should have coffee then study after. The next time we had class I arrived later than her for the first time and I noticed she changed seats to the other side of the class. I found this a bit strange and she left right after class without even acknowledging me. Is this is a sign she changed her mind or became disinterested quick? I think I screwed up by planning a coffee date all the way up until the weekend or am I just being insecure. Need advice how to move forward.