Why we broke up? Confused?

So, we first decided to get to know each other , and after month and a half , we ended up in a relationship which last for 3 months.. it was beatiful relationship, mine best, and by her words , her too.. we firstly were friends and then boyfriend and girlfriend, every date/meet was fun, surprisable and good, everything was good before her excursion where I found out she was holding this guy friend's arm non stop, they were sleeping together, they got drunk together and kissed , they became very touchy too, and she was instisting to be with him all the time, and I decided to break up and finish it, I just could't be in that relationship anymore, even tho she was fulfilling me like never girl before.. I mean, it passed 4 days from break up , and I'm still confused why? why would somebody just drop 3 months of something best that ever happend to her ( her words) for some guy who is not half the guy I am (mine words).. still confused...
Why we broke up? Confused?
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