PPKO, things will get better. Try not to let it unbalance your mind too much. My wife and I came very close to divorce late last year (November/December). I believe my martial arts training was and still is sort of an issue for her in the whole thing. See, she has no interest in martial arts at all. She fails to see that it is more than a hobby, it is a life path. Martial arts is very similar to a religious following with regards to dedication and how it guides one's life.
So I really don't know that divorce is any higher with martial artists, but I can see a potential and I do think it can cause alot of conflict in a relationship just like religious beliefs and followings can do under certain circumstances. However, these things can be worked out. I honestly believe, my situation would be far different if my training was something I was doing prior to our meeting each other, rather than after marriage and a child. Another words, if it were part of the package beforehand, I believe it would be easier for us. I also see *this* as training as well.