Insomnia,
Like you, I dance competitively with my life partner. My partner and I, are both non-confrontational people, meaning we avoid arguments of any kind in any situation (which is not very healthy either). On the dance floor, we do fight, in a healthy way. We often leave the studio upset, espacially close to a competition. We make up in the car, that's our way. We both say what frustrated us calmly, admit our own mistakes, say we are sorry and find a way so it doesn't happen again. By the time we get home, the frustration is all gone!
I do want to point out, that sometimes it is extremely hard for couples to not fight. It really depends on the personnalities. My parents take dance lessons together, and fight a lot! Knowing them, I am pretty sure this is unsolvable...sorry mom and dad! They have been married for 35 years, so I guess that what works in the house doesn't necessarly work on the dance floor.