Sounds like the problem is you. You're becoming the WAS which is what often happens in your case. Have you thought about going to C alone?
He's trying his hardest. He stayed on the couch to give you space (sound familiar with what you did to him when he was the WAS?).
"I started to see the silver lining to not being with him. Sometimes the idea of not dealing with this anymore is so nice."
Typical WAS thinking. Now you know how he felt.
"We just have to get back to a good place, or we're dooming ourselves. There is just near constant conflict that we're both responsible for and it's wearing us down."
Sounds like it's wearing YOU down. YOU are putting so much stress and expectations into this that you're getting the stress and taking it out on J. It sounds more like he's walking on eggshells around you rather than the other way around because he doesn't know what's going to set you off. And if he doesn't do something the way you expect it to, you get upset. He's not a mindreader and you have to relax some.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.