As a women who can relate to the way your wife feels, I think it's great that you keep telling her that you think she's great and was a good wife. Us girls need to hear that. I know it's hard to hear her bringing up the things you did to hurt her over and over again. I hope that you can stay patient with her.
I do believe in the long run that you continuing to take responsibility for your part goes a very long way to restoring your M.