Help:( Girlfriend's best friend fooling around

Me and my girlfriend have been dating for 11 month, (1 year on Sunday). A few months back i was on holiday with my parents (im 17) and i was texting my girlfriends best friend. they've grown up together and have been best friends since they were 3 year olds. Anyway she's always been a bit funky with and we send pictures to each other because i was so horny and my girlfriend wasn't texting me (no excuse i know). Recently my love for my girlfriend has grown alot and i kept feeling guilty so i told her. I love her so much and i dont know what to do. She's not returning my calls and she has called it off with me. What shall i do? she made friends with her BF instantly and told her that its just a boy that comes between their best friend relationship and it happens to everyone. How can i win her back\? i'm heartbroken :(

You need to learn that if you choose the behavior, you also choose the consequences. What you did is a form of cheating and completely unacceptable. She is right not to forgive you

Hopefully you've learned your lesson and won't do that to the next girl you care about.

Next time, look at some porn or pleasure yourself if your horny instead of being dirty with your girlfriends friend. It's never going to end well.