Just relax and stay in the moment, Bud. There's no need to plan the wedding or to start running from her. Just realize that this is a nice contrast to those lonely nights, and that you're merely spending a good time with someone who has no stored up, festering resentments toward you.
Merry Christmas to you and yours! I hope this new year brings you both peace and happiness. Let's plan a phone convo when you get back.