Can't get over cheating ex
My girlfriend and I became got together at the last year of high school. Our relationship became a long distance one when I got accepted to one of the best universities in my country. That was an opportunity of a lifetime and I went for it even though it I had to move far away because it would be best for our future. (yeah, even though I was in high school I was already thinking about OUR future, pretty rare I guess)
I took every opportunity to go home when there were school breaks and meet her. We also constantly called and texted each other. It was OK for about a year or so then one of my friends at home told me he has seen my girlfriend go out with her ex during high school. I confronted her, she told me it won't happen again, we made up. After a year and a half it was OK until another friend (a trustworthy guy) told me that my girlfriend started to go with another guy. We broke up after that.
But I really love her and she was very apologetic. I really wanted to fix our relationship so we patched it up the summer before I went back to the university for my last year in college. However I can sense that our relationship isn't the same as before. Distrust on my part maybe but I can feel that she has changed too. During a fight over the phone last week she has confessed that she has cheated on me just recently and even slept with the guy. Of course I was very angry but she was crying very hard and begging me to forgive her.
I never cheated on her throughout my college years.Now I know that I really should just break this off.my problem is that I know that she is a weak willed type of person and very impulsive . I keep rationalizing to myself that it's my fault that because I was not there by her side that she cheated on me and that she has done these stupid things because I didn't look out for her. I also am very attached to her and used to her being there for me while I'm struggling in college. I just can't get her out of my head.
I know the usual advice is to go out meet other people and do fun stuff, but I'm in the middle of doing my thesis so I can't do that. She and all the fun stuff we had together keeps popping into my head when I'm doing my research since she used to encourage me on while I am doing work.I know I should forget about her but I just can't. Any advises?