Riptide, it happens. My wife and I lost all our friends over the years. After we got married, our friends started to drift away. When the kids came along, they all dropped us. My wife and I tried everything to get them to come out to the house and see us. We cajoled, begged and pleaded for them to visit. Hell, we still do. We never, and I mean NEVER, felt or hinted that we were too busy to see them. It just happens. My advice, stay in contact. If she comes back, then it was meant to be. Don't stop meeting other people and making other friends. Good luck.
