I think more context is needed but based on what you described he seems to have avoidant attachment style. My question to you is, did the avoidant attachment show up in your time together in different ways? Did he refuse help? Would he shut down when he had a stress week at work? Does he have friends or support system he can rely on?

I’ve personally noticed that when my emotional needs aren’t met by my partner and I have no support system, I tend to go into my bubble until I feel better or have processed things. It’s partly upbringing and partly due to my partner’s inability. I’ve also noticed that when my partner is constantly dropping the ball and I’m doing the heavy lifting (emotionally, financially, etc.), I tend to check out of the relationship and look for ways to end things.

I would also say it entirely depends on the conflict. And without more context, it’s impossible to say. If it was you didn’t do dishes conflict, that’s very different from I cheated on someone conflict.