As a couple, staying friends has always been important for us, so we have a lot of simple rituals that help us stay that way. E.g together we write inspiring, funny, and uplifting messages on sticky notes and leave them in unexpected places around our community.
Don’t complain about every small thing that irritates you. Be more accepting and let things be. Your partner is a different human being, so let them be that. Accepting the differences makes the similarities more enjoyable
Before speaking with my partner about what's bothering me, I usually let him know what I hope to get from the conversation. e.g "I just want to be heard", or, "I want your inputs on something and love for us to problem solve together", etc.
We tried hobby swapping and found a whole new world of things to do together. Who knew? Turns out I actually liked some of his hobbies! Now we have a whole list of shared interests, and our bond is stronger than ever!
We realised that division of household chores makes everyone better off. Over time we figured out what each one of us is good at, what we each love/hate doing, and then arranged accordingly.
When we fight, one of us tries to stay calm and not make it a win-loss ego situation. It doesn't mean don't share your point of view, instead, wait for the nerves to have calmed down.