So sorry to hear. A lot of us have been there.
Whatever issues you may have in the relationship, her cheating is not your fault. This is something she did, a choice she made. You're the victim here. Don't look for reasons to feel guilty or for things you could have done to prevent it. There aren't any.
Just a personal opinion here, but this is something where there's no second chance. You need to move on. It's tough but the only real option long-term. Trust has been broken, and most likely more than the one time you know about.
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