The truth is we all make mistakes. It seems like we all make the same mistakes over and over. If one can make the effort to get better by seeking council then maybe there is a way to fix it. However, if the problem still exists then it is right to let go. Something in the relationship could be fostering the other to continue to behave the way they are and it is like a gift to the other to get out. I just see the woman in this situation as having low self esteme. She obviously didn't want to do it because she admitted it and apologized when she could have lied or kept it a secret. She doesn't want to be alone. We can't say why she did it but it doesn't sound like something she really wanted to do. Cheating is wrong but so is alot of other things. Spouces can be so wrapped up in their work (workahalic) that the other one feels cheated themselves. Both are wrong but it is best to admit mistakes and work to fix them. That is when you know the person loves and cares enough, for better or worse.