Couples that train together stay together.
X2. The only time I was married, I found out too late that I was in trouble when I realized his idea of exercise was drinking coffee 
This thread certainly has potential, but I’ll add that there is perhaps a slight difference between men and women in terms of what we want from our spouse in terms of traithlon participation (or maybe it is me).
When I was training for IMC in 1991, I started dating my wife. I was also working full time and doing a business degree at night school. I put the cards on the table and said, “This is the way it is…don’t try to change me”. Back then she also did some of the sports but not to the same degree, but I think she always got that being active was an extension of my personality. When my son was born, I obviously had to curtail the training activity and over time figured out how to make it less intrusive on family life, but like all couples it was a source of friction, but over time we found a sweet spot.
I don’t need my spouse to workout with me, rather I’m happy she lets me do my thing with great backing. When I am out training, like when I was in the armed forces, it is like hanging out with my “unit” (rather than with my family) and the guys I train with become the extended family (and I like it that way). We both have our interests and balance each other off, with our strengths adding to family life and our weaknesses being overcome by the strengths of the other (or the occaisional prodding, but that’s part of being married).
So all that to say, I don’t think that most guys need to train with spouses, in fact, they probably get more enjoyment training with the guys (rather than hanging around the bar with them and getting drunk). We get boys night out but we’re doing something productive too :-)…oh yeah, and so much for “don’t try to change me”…21 years later, I’ve hopefully changed for the better, so the trick is you want him to believe he is not being changed and change him along the way and soften him up without him knowing it
(maybe I should have put that in the womens forum…)
…and in the end neither spouse will be able to do this sport. Our relationships have to be about more than the sport, because when it ends, then you have nothing left. In the mean time, support each other in what makes us excited and who we are.