When I was a pilot, no matter what happened the day of, before, or two days before a trip, I always made sure I kissed my wife (girlfriend at the time) goodbye. I never wanted to leave on a trip knowing the last contact we had with each other was a big fight.
Now, as a police officer, I do the same thing. When I was working midnights, we might have a fight at 8PM, but at 11PM I was waking her up to kiss her goodbye. Now on days, we might go to bed angry, but I wake up and kiss her goodbye. It may be morbid, but I don't want something to happen, and have my wife's last memory of us together being an argument. That hasn't changed in either career.
I think you guys need to have a serious discussion about what's going on. Bring up your concerns to him. Nobody who supposedly loves each other should go away for days on end being mad at one another.