hello guys I have posted before about my problem so I'm posting again as I couldn't find the earlier thread that I made before. Well to narrow my story down I was with this girl for nearly 4 years and we broke up and for the last 4 months we stayed in contact and stuff. There was a period about 2 weeks ago where I gave her a final goodbye letter and said I was ganna move on but she begged and begged me to stay. Her cousin and her friends have been telling me that she has been going out with this guy on her facebook and from her college but she kept denying it and her wanting me to stay in her life and begging me to and her threatening that she would harm herself if I left convinced me that she has learnt her lesson. Anyways so we met 2 weeks ago and we said that we would get back on track and everything and that we would both study but love each other and when the time was right we would get back with each other. So around 4 days ago I asked her back out and she said no because she wanted to study and was scared that we may break up again while shes doing her uni and that will have an affect on her. Well for the past 2 days we haven't messaged and this afternoon she messaged me wanting to change her details at uni to something else so I knew there was something wrong. So I asked to see her because I wanted to see her due to stuff becoming really dry between us and she messaged me saying did u talk to that guy? and i said no and then she messaged me saying I can't be friends with you and that my heart is somewhere else blah blah blah. So I said ok but I want you to say it to my face so I went and she came in the car and we talked and she said that she likes someone else but shes not dating anyone. I have however confirmed that she has been dating this guy since the start of january but I will not say how ( just trust me) but what I want to know is why did she do all this? I mean I feel sorry for her bf because when I saw her 2 weeks ago she kissed me and we have been saying i love you back and forth to each other. I just feel bad for that guy because she just kind of cheated on him and she played me. Anyways What I'm asking is what is the best way to get over all this because it has been on my mind for 4 months and I'm sick of it so what is the best way to get over all this without me having to do stupid things like start another relationship because I'm honestly not ready to start another relationship right now. So I would like any advice on this or from someone who has gone through this all.
Thankyou in advance