I was going to post a similar problem on here but I thought I would just ask on this thread rather than start a new one hope that's ok.
Basically I found out over the weekend that my fiancé who I've been with for 13 yrs an have a child with has cheated on me. I don't know why but I decided to look at his fb messages, I've never done this before an I saw a message from his sister who he has fell out with recently, it said 'who are you to judge me when I'm single when you've been sha**ing (girls name) whilst your with (my name) you wouldn't like it if she found out, I have times an dates'
I think I'm in shock, I have no idea what to do, I called his sister and asked her about it, she claims she was drunk an wanted to hurt him so made this story up, I don't believe her though, it's too detailed to be made up! I haven't spoken to to him about it yet as I know once I've opened that can of worms there will be no going back, I just don't know what to do :-(