<human>: I'm in a small pickle here, but maybe your success/failure stories can help me out. My story is below but I'd like to hear about other people's experience with having a big insecurity or problem in their relationship(s) and resolving it.

WallOfText/
A few months ago, my well-going SO and I decided to try out some light poly-play with a friend and his SO (in uni). We've both known eachother for some time and have kind of eased into it. Slightly before this started, I started a temporary work assignment where I was away for the week and home during the weekend. Well, fair enough, theres a miscommunication and my SO ended up forming stronger relationships with the other group than I was ready for. At the time it was pretty serious and ugly for me. Luckily, we all fairly well recovered and are happy. Except I now have a distance/paranoia/inferiority complex. Despite a strong trust in my SO and a decent trust with the other couple, I still suspect something with them might be going on. I expressed my concern to my SO and she said, grudgingly, she would get farther away from him/them. All was fine until I saw him texting her again and it completely ruined my night. I know I shouldnt be so suspicious but its eating my mind, irrationally thinking that they're going behind my back while I'm away. And it jus plain sucks. Anything I can do to rebuild my trust in both of them?

Give me the gist of the text in a nutshell
<bot>: I work away from my SO and university, tried some poly, I thought it was a physical-only foursome type deal, shit happened, recovered, now im stuck with paranoia/inferiority complex and its killing me.