A friend of mine quoted the statistic (lies, damned lies and statistics??!) to me that the divorce rate in aviation is somewhere around 60%. So, it obviously takes a huge toll on relationships, as does any job that requires a lot of focus. And then of course, there's the enforced separations due to shift work - the need to live virtually separate lives because your schedules just never coincide. I suspect it's just the nature of the beast, and takes a huge effort and very understanding partners to keep it all on track. Good luck in the future.