You can go back to her and try to talk to her about it. Tell her that during that time, you were just not ready for relationships or explain the main issues that stopped you from accepting her. Tell her that you will make it up for it.
Say you would like a do over. You seriously messed up and want to try again. Or just casually ask, "if I was to promise to be smart this time instead of stupid like last time, how about we start over?"