Hi Bob ~ I'm afraid it's all over between you two. Since you weren't sure about the affair and wanted time, she just moved on. She has the right to move on since she figured you weren't really committed to the relationship. So evidently she found someone else.
If I were you, I would NOT bother her with trying to get back with her. She's just going to get angry with you, and you could screw up something good that she has with her new guy and I don't think you really want to do that. Then she'll REALLY hate you! So just leave things alone.
I wish you the very best Bob. I'm sure you'll find someone just as great as she was! God bless you Bob, and please take care. Hugs, Lee