It's hard not knowing her side. I hate to just assume or guess things about someone. When I mean her side, I mean how she feels, what's going on in her mind. Her saying she gave you 10 years? Was it "only" that she caught you interacting with another woman online? Or, did she have other things she was unhappy about and that was just the straw that broke the camel's back? Women can go through changes and 10 years can be a kind of turning point, a fear of how time is running out to be independent and have a sense of personal value. Maybe part of it is not liking it when you get deployed, could be she did not like that something could happen to you too. Maybe that is part of why she wanted to finish getting a degree and have time to be financially independent.