I had one of those. She started cheating on me. That was one of the best things shoe could have done for me, as it turns out. She got preggers and married the guy They were a horrible match. She started calling once a year (after I was engaged to Sharon), at first asking if we could go eat (she suddenly had to get off the phone when I asked if I could bring my finacee), then literally just asking, "Are you still happy? OK, bye." Eventually after a couple of moves that required phone number changes, I quit hearing from her.
Sharon, on the other hand, is a treasure.