[MotoKrossDude]

someone please help me.
i am a sixteen year old teen and i have been dating my girlfriend for 2 years now. she is the love of my life. she is my best friend and she makes me a better person just by being there for me. the problem is, that over summer vacation she went to europe for three weeks for a school thing. when she came home she was acting strange, and while we were laying in her bed listening to music she told me she had kissed this guy three days before she went home. she said it was only 2-3 kisses, and i beleive her because she told me everything i wanted to know. so i know she is not lying. but it was the worst pain i had ever felt. i couldnt figure out why she would just forget our love that easily. she had told him that she wasnt as lonely for me as she thought she was so she thought she might want to break up (another story but we figured everything out) but she still kissed the guy. it just hurt more than anything, i know it was an accident but it still hurts, what should i do?