found pictures sent to another guy

I've been with my fiance for about 2 years, and overall we have a great relationship. We rarely argue, and if we do its never anything serious. She has a 3 year old daughter that calls me daddy and I love her like she is mine. We are happy, and I'm not in denial her she is truly happy with our relationship and doesn't want to loose me. The problem is a few months back I noticed a conversation on her phone. Only saw part of it they were talking saying how they missed each other and they said they loved each other. Then there was 30 minutes between txt and he said he was on his way. She said sorry Im going to bed(8pm), he replied ill hurry then she told him Im no fun anyway. I chose to let it go and trust that she would never do anything. she told me about the guy and that he used to be a really good friend, and there was nothing really explicit in the txt. Now a few months down the road I was trying to Fix her Google account, and when I open it there is an email to him with a dirty picture, she had sent me the same picture that day. and a conversation on Facebook where she said she called of the wedding because she couldn't marry me. She chased me down saying how sorry she was, and she was stupid and she always fucks everything up, and I deserve better. I don't want to lose what we have, but I'm hurt and i don't know how i can trust her. right now I cant even look her in the eye. I don't want to be one of those guys that checks her phone, I don't want to be in a relationship with even a little mistrust. I don't want to have to question anything she does. I just don't know how to get passed this. and Its not just about us WE have a family. I really want to find a way passed this, and a way to trust her again. I don't know what to do

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