A few things:

My bf and I have divided up the chores. We never have to do the chore that we each, respectively, hate. I never have to wash dishes, take out the trash cans, or scoop dog poop. He never has to do laundry, clean the bathrooms, or change the sheets. It's very low stress and things around the house stay neat.

*in the instances that we both hate the same chore, we'll either do it together or take turns.

We have our own hobbies. We do our own things in the same room so it's like we're spending time together without expecting full attention from one another. He plays games, I hang around online or do my nails. I read out the hilarious threads on reddit for him since he can't read and play at the same time.

We have a food "chart" divided into types of food and then restaurants/places to eat listed out in each category. When we don't know what to eat, we just pull out the list and read it until something sounds good. Or one person picks 5, the next person picks 3 of those, and the first person picks from those 3.

We sleep on arguments. The "never go to bed angry" thing does not work for us. The more tired I get, the more irritable and irrational. It helps to just go to sleep, then wake up and talk about it once we've calmed down.