[nabs]

do not under any conditions, what so ever, tell her you cheated. this will ruin her, her self confidence and she will have trust issues forever going forward in any future relationships she will have. I know people say that omg its bugging me so much, I have to tell her and blah blah bullshit, this is not TV, you are not living in a soap opera, if you truly care about her and love her like you say you do, she should not know. People who have been cheated on before will understand what I am trying to say here.

You've done the deed now live with it, don't tell her so it will make YOU feel better, because it will ruin her, and its not fair to her.

If you don't want to be with her anymore just tell her that. Don't lead her on, if she's trying to fix things and you know that you don't want it to go further, be honest with her on that point.