Women don't hate cheaters, they hate the men that cheat on them specifically, or someone they care about. If he cheated on some random person who means nothing to the woman he's with now, she's not likely to care. A lot of women I know think that if a man cheats on his gf or wife, that it has nothing to do with him and everything to do with a failure on the part of the woman he's involved with. Now while I agree that sometimes that might be the case, the overwhelming majority IMO have nothing to do with what your partner is or isn't doing. What always amazes me is how shocked they are when he turns around and does the same thing to them. If he cheated before, you shouldn't be surprised when he does it to you. I think Kat needs her head examined for getting involved with Jesse James, but then from what I can tell she's never been long on smarts or common sense.
When I look at her I think well, she is with a man who can't be faithful and she is dumb enough to take that chance. She'll proabably get hers. For me the other aspects that came out about him are even more troublesome than his cheating. The assoication with white supremicists per his lover is more than enough to rule him out in my mind. Total loser and now she is too by association.