If you love her get over the past and continue your relationship. She is being very open, allowing you to basically spy on her at any time. There has to be mutual trust or there is no relationship.

If you just can't let it go , well then it's best to end it for your sake and for her's .. You can't hold her actions over her head forever and expect to have a healthy relationship.

Either be 100% in or remove yourself from it.