Telling your ex about your groupie habit doesn't mean all sins are forgiven. (I get the feeling that you believe this to be true given your capitalized "BUT".) Do you realize that much of the trust was broken way back then, even if she says that she has been able to move forward?

Do you realize that she may have had the same sorts of thoughts about you with other groupies? Maybe she was trying to get back at you. Maybe she was pushing that boundary just to make you mad. I know I'd be tempted to, with the caveat that I didn't technically cheat....unlike you....so I am still the better partner.

Its going to take a heck of a lot of work on both your part and her part to put this relationship back together. If you think that your little breakup test is going to prove something, you're wrong. These sorts of games never turn out the way that you want them to. I see this sort of thing as being childish. (I had another friend do something similar as a "test" and guess what? He lost the girl. No surprise there.)

And, I find it very odd that you're the one who has trust issues with HER! I feel a double standard at play. Neither one of you really trust the other, but I get the feeling that you are feeling very much the victim in all of this......you do remember who cheated first, right? You do remember who broke trust first, right?