[sadman]

My girlfriend and I decided to become engaged last month after three years of dating, I am 27, she is 26. She has been really pushing me to buy her a ring for about a year and I finally felt like it was the right time to take the next step.

She seemed really excited about being engaged and we started planning the wedding right away (at her insistence). About a week after we were engaged she went on a trip to a local resort for a conference with her classmates, as soon as she came back I could tell something was different. She started getting phone calls from all of her new friends at school, but would leave the room to talk to them and would never mention anything about their conversations when she came back.

Things seemed to get a little better for about a week, but then we had an argument about her getting a job when she wanted to join a dance group that I wasn't very excited about paying for. The night after that argument she went with her friend to a local hospital to try get a job, and ended up staying out until 4 a.m., even though she told me she would be done at midnight. We had a little bit of an argument, I told her that I was worried about her and would appreciate a call if she was going to be that late. She then informed me that she wasn't happy in our relationship and was actually forming feelings for a lesbian classmate.
She moved out after that argument and called me this week to say that she felt our engagement was over, she is very depressed and doesn't know why she has no feeling for me anymore. I am worried because she has a difficult past (rape, medical problems) and refused to see a therapist.

We were in love for 3 years, I don't understand what happened, how can she just turn off the swith like that? Please let me know what you think.