When you have been cheated on, the first thing you have to do is decide if the relationship is worth saving. Both of you must really want to work at gaining trust and healing from the pain and disappointment of the betrayal that goes along with the infidelity.
Communication is needed to understand what caused the infidelity in the first place. This is crucial in hopes of preventing it from happening again. Couples counseling could help with an unbiased third-party. He has to earn your trust again. Trust is very hard to gain, once it has been lost.
Don’t obsess over information about the other woman. It was your man who betrayed your trust, the other woman doesn’t have any loyalty to you. You need to know if it was a one-time affair or a lengthy affair. A slip up is easier to forgive. If it was with an ex, that could mean there are still underlying feelings between them. That would pose a problem in trying to salvage the relationship. If he has cheated on you before or he has a pattern of cheating in all of his past relationships, he most likely will cheat on you again.