You want an adult answer? You don't deserve either of them. How could you sit there knowing what you did and still speak to your original girlfriend with no remorse. If you truly loved her you would have told her when it happened, you would have told her how you felt. Instead you have been lying to her and keeping it a secert until now its time to piss or get off the pot. You can wait for one of them to find out or you can fess up and hope one of them will still be with you. But to be honest I think you ruined chances of either working out for you.
