I can understand that, Kitty. I can understand it all too well.
For about 10 years, my job involved me moving all over the country for short periods of time - sometimes as long as a year, sometimes only a few weeks. I'd socialise with people easily enough but there was always that metaphorical Sword of Damocles over my friendships. I think it may have messed with my ability to make normal long term friendships with people. My romantic nature didn't help matters much either. >.>