You want to do everything possible right now to prove to her you're trustworthy again and faithful. you have your simple answer. Do exactly what it would take for someone to prove their faithfulness. Step into her shoes and imagine being betrayed and lied to for a long time, think about what it's like ot realize the person you are supposedly tied to has led a double life. What would it take for you to believe them again?

Don't cop out on this one. If you tell yourself "well I'd forgive them and blah blah blah" That's ******** and you and I know it is. I say this because typically it's a knee jerk reaction to what I just said. Think, ponder and analyze what it feels like to be betrayed, cheated on and lied to and then once you truly understand her position you can probably figure out what you should do. I make no guarantees here either. what you "should" do and what will happen are two different things.

For me, being cheated on is something I do not come back from. I have not yet moved past the ones that cheated on me and come to a place where they have ever regained my trust as it was at one point in my life. I don't know... they never went out of their way to prove anything to me, so I can't say if it would have changed things but the truth is, when my heart is given, my trust is very sincere, when it's broken, something very important to me has been broken.

You should also ask her. What you can do. If she says "nothing" then leave it at that, you can't change her mind. You can only do what is right moving forward. what she does with it is up to her and entirely not your decision.