A combination of things... her family (very religious and opposed to sex before marriage), started to give her pressure to not date me, and on top of this she began to say things to me like "You're too intense" because I was more emotionally invested in her than she was in me..
It got to where the pressure was too much, and she doesn't cope well with pressure at all, and she asked to just be friends..
For a period of two months after this we had various combinations of friends, not talking, and hanging out like we used to (minus the sex), and there was occasional drama as I'd try to convince her to revisit what we had, and not to throw it away.. Culminating one night with us actually having sex, albeit very briefly which ended with her spilling a glass of wine while we were passionately fucking! she stopped and then decided she was done and wanted to sleep.. The next morning she acted like nothing happened. Later the next day we went out again, drank again and went back to my place where it looked like I might get lucky... well, somehow an argument started over something very dumb, and she threatened to walk home (she lives close), and I told her to "Get the fuck out then, go!" We made great memoreis but I was needy.. I wonder if it's too late for her to miss me after a long break from any communications?