I was dating a girl for over a year and a half and in like any relationship we had our ups and downs. I have never been in love or had a serious relationship for that matter but I know that I feel in deep with her. I proposed to her on Christmas day this past year. A couple of weeks went by after I proposed and found out from a friend that she cheated on me. I confronted her and she totally denied it for 2 days. Finally, she confessed and a month or so later I found out that she actually had sex with the guy and not just messed around. Within a 4 month period she had kissed another guy and let a guy play with her. I had to find out by other people because she never told me. We are currently broken up again and she wants me back. She tells me that she has completely changed and how she doesn't want to be that person anymore. She wants to be with me and only me. This is my problem. If she truly loves me and wants to spend the rest of her life with me, why risk loosing me by cheating. I don't know what to do because I don't know if I can ever trust her. Do people actually change????