<human>: Can you give me a shortened version of the text?

I recently have begun my summer session at college while my girlfriend has chosen to stay behind for the summer. We have been calling each other and video chatting each other every night as if we are still in a relationship and each night she has told me how much she loves and misses me. We have been together well over a year at this point. 

This morning I awoke to a string of messages and screenshots of messages from her friends explaining that she had sex with someone else. I called my girlfriend and asked her about it and she denied it, but when I explained that I had pictures of her messages and of her talking about having sex with the same person again, she hung up. She told me I was too much into her business and it was none of my concern and that I was being crazy. I asked her for her side of the story and she has yet to give me her side and just says that I am being a crazy person and that I should not be invading her privacy. 

What am I to do? should I continue to ask her side of the story or Should i say my goodbyes and never look back?
<bot>: Long distance girlfriend had sex with someone else and claims I am crazy for invading her privacy but still says she loves and misses me. Should I end it or wait for her side of the story?