Hi. I am so sorry you got hurt. That's an awful thing to have to bear. Been to that rodeo myself once or twice--it's a sinking feeling, being cheated on. Big hugs to you.
I am going to be really unpopular here, though, about the girl he cheated WITH. Someone earlier in the thread mentioned that she likely knew about you... that's not necessarily true. Many, many, MANY years ago, I met this man through some friends... nice guy, nice looking, single, self-employed, no kids, dressed fairly decent, very smart and a great conversationalist. We hit it off right away. A few months later, we got closer and started dating. Things kept going great. I'd been to his house, he'd been to my house, we'd go places and do things together, and things started getting really cozy. I was falling in love.
Then.... I got hit in the head. Whenever I would come over to his place, I later found out he would "hide" certain photographs and things. What kinds of photographs, you wonder? Oh, I dunno, maybe pictures of him and his wife, her family and relatives, etc. I had spent probably half a dozen nights sleeping in that bed and had NO idea. I found out about the wife by accident, was going over to his house one day out of the blue and he insisted I NOT come over right now, no matter what, and.... the wife picked up the phone in the other room and said, "Honey, who are you talking to?" To this day, I remember the feeling of my stomach going all the way down to my feet, then coming back up and sproinging on the base of my brain, then settling back into the center of my gut and wanting to vomit.
The "other woman" doesn't always know. It is sometimes as painful and shocking to her, as well. I know it was to me. I had let this guy in my life and he had become part of my kids' lives, as well. It was really hard to explain it to them at the time. It took a long time to get over that, but I finally did learn to trust again and met and married a wonderful man who doesn't cheat. He is my best friend.
You can and WILL find that. Everybody deserves that kind of commitment, and I hope you will find the love you deserve. Hugs to you!