Has anyone stopped to think that mabye she called it off simply because they weren't right for each other and that it had nothing to do with his career? I know that's how it was for me...my ex was an airline pilot and I called it off because we weren't right for each other, not because of my ex's career (we're both pilots) or seperation issues.
MJ- No worries man. It'll get better. You'll find the one who's truly right for you (regardless of your career).
-ArchAngel