Dear Lizzie ... I dated a girl back in college, and at the time, I cheated on her with her best friend. We broke up and I haven't seen her since. She got married and I've always thought of her in the back of my mind. Recently, now in our 30s, she contacted me out of the blue. She told me she's getting a divorce and she wants to be with me. There's another girl I've met and I like spending time with her. I'm just torn on what to do. What do you suggest? Should I get back with my ex-girlfriend from a decade ago or write her off and keep things going with my current relationship? – Second …