<human>: Well to start off I am 26 (m) and my fiance is 23 (f) and we've been together for 2 years. Recently my fiance told me she was sexting with a guy from where she used to live and had a crush on. I told her I was hurt and didn't like it, but I didn't say to much after that because I needed to process it all. A few days later we talked and she said she wouldn't do it again and she only did it because she thought I wouldn't care. I saw some of the messages and she had talked with him about making safe words to avoid getting caught and that destroyed me in a way. We talked more and she texted him saying it wouldn't happen anymore. She says she loves me and she only wants to be with me and deep down I believe her. The two main questions I have are how do I trust her to not do anything like this again and why would she do it in the first place? I never had trust issues with her before and could care less if she went out with guy friends or talked with anyone, but now I worry constantly about who she's texting and what she is doing when I'm not around.

Can you give me a shortened version of the text?
<bot>: Fiance had a sexting relationship with another man we mutually know. She told me after the fact for some reason. Said she won't do it again. How do I trust her again?