I've been with my OH for nearly 4 years now, 2 years ago I found out he was cheating on me with a family friend, they kissed at a wedding while in her room & from there things went to texting, snapchat & dirty messages/videos. I found out when she messaged him asking to meet up. He practically ran upstairs (pretended to need the toilet) messaged her to tell her she needs to reply quickly & say she txt the wrong person as I've seen the message & am annoyed. She did reply & he was pleased with himself when I believed it but something was niggling at me & 4 days later he admitted to his disgusting behaviour. My issue is that I can't stop thinking about it, the betrayal & lies & how 2 weeks before I found out, we were all at a party together & I danced with her, had drinks & bf sat there so casual & relaxed. If I was messing around with another man & he & my bf were near each other I'd be a nervous wreck! What kind of sick twisted person just sits there while your mistress & gf are chatting. Please help me, any advice would be appreciated