This is most likely to happen since she's still close to him. But it is up to you to choose, can you trust her again.
Well she was a 4 hour plane ride away, drunk with people I don't know and slept with a guy that I don't know. There's basically no way I would have found out but she told me she cheated. She told me the entire night, well all that she remembers, she thought I was going to dump her but she still told me because she couldn't live with the fact that she cheated on me. She cares a great deal for me so I trust her word that she won't fuck around like that because she was so scared of how I would react. I really don't think cheating again will ever happen.. to be honest I don't even fully know what the problem is.. I think the problem is nobody else would give this a shot, everyone else would ditch her.. and that makes me wonder if I'm being stupid even though I know the consequences and I totally understand I come off as a desperate guy that doesn't have the balls to move on.. but I don't want to give up, and is that wrong? I cannot decide for myself if I'm doing the right thing... there's a fine line between loving her this much and depending on her too much.
What she does is at least as important as what she says. Did she break it off with him or is she still attached to him to some degree? Not that I am recommending this, but let's say you do nothing: In a few months the answer about what to do will be obvious. Time is amazing isn't it?
she isn't dating him.. she literally talks to him through texting like once a week and the conversations are like hockey scores or something. She sees him a couple times a year, usually with family around. When she cheated on me it was just a mix of everything that could've went wrong happened.. a perfect storm i guess.