People Involved(Disguised)[Everyone Involved Knows Each Other]:
Boy,
Girl(Boy's Gf),
D(Boy's Friend For 5 Years),
Z(Someone D Tells Everything To Cos We Can Trust Him),
K(Z's Ex Gf),
S(K's Good Galfren)
Situation Now: Me(Boy) just found out during my stay in the hospital after a lorry accident that D and Girl had something going on behind my back.Today I confronted D infront of Z and D admitted to hugging and kissing Girl. Things between him and me have been settled but now I'm still very angry and upset over this matter. Reason being; After 5 years of friendship D can actually betray me and make a move on my girl. To me the first rule in a friendship is that you should NEVER touch ur fren's stead even if you think he/she is making a move on you OR you intend to have a fling with him/her..(After the thing happened D claimed he just wanted to have a fling with my girl)
Story: I knew Girl slightly more then 2 months ago and we were interested in each other. We decided to try out going into a relationship for a month and see if we were suitable and if the relationship was stable. I became her boyfriend on the 13th Oct and soon after that things were going quite well until I got into an accident(21st Oct) causing me to suffer a fractured knee and wrist. During this period 21st Oct-30th Oct, the group had a bbq, and I found out after the bbq my girl and D went to watch the sunrise together. Shortly they hugged and kissed. I knew this the day after it happened and I've been thinking about it. D has also made a move on S before. There was this day after I was discharged from the hospital where K, S, D stayed at my house overnight. K and I slept on the mattress, S and D slept on my bed. After that night we found out that D had actually outraged S's modesty. I and Z knowing this happened confronted D and scolded him about it. We then proceeded to let this matter rest after a verbal agreement between S and D. After I knew what happened I kept thinking about what to do about D and my Girl. He being my friend should not even have took the advantage of my Girl even thou she did felt lonely during my 2 weeks stay in the hospital. Things between D and I have been settled and now I'm left with the decision to talk to my Girl about it or to keep quiet and leave this matter to rest. The reason being that she's been treating me really well after our 1mth anniversary and i really treasure her. Yet the fact that i know she accepted D's approach was something that was over the limit because when things between D and my girl happened, I was already in a relationship with her! I felt very angry and upset over this matter and i really do not know what is the next step because I do not want to lose my girl yet i want her to come clean with me.

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I Hope You People Understand What I Am Saying And My English >.<
Thanks To Everyone Who Bothers To Read This And Give Me Advice!