I think if she really felt that bad about you, she'd be gone. I mean, what is stopping her?. I think alot of it is her own guilt and embarasment of getting "caught"
my wife did the same thing after I confronted OM, that ended it on the spot. but she was sooo pissed. now she tells me it was the total humiliation that she let herself slip into the gutter and become a liar and cheat. she would turn that into anger toward me and the kids.
I gave her alot of space because when she first came home, I didn't like her and really didn't want to be around her, so that worked out well. it took about 5-6 months before she got back to her old self.