Manage your expectations of one another. If your partner is the type who likes to brood instead of fight, don’t try to pry a fight out of them. Some fights a best left for the morning, it’s ok to go to sleep angry when you need to cool off and think about what you’re going to say. When you disagree, stick to the issue at hand. Don’t drag up old fights, old flames, or old issues because it will only grow out of hand. Find a game you both like, XBox, Monopoly, Phase 10, MTG, D&D … and commit to spend at least one night a month playing.