After every argument, ask yourself one thing: what part was mine?

Almost no disagreement has a single author. Even when the other person started it and was mostly wrong, some piece belongs to you: the tone, the timing, the thing you dragged in that had nothing to do with it. Finding that piece is not about taking the blame. It is the only part you can actually change.

Give yourself a few minutes after the next row and answer the question honestly, with nobody watching. Then tell the other person what you found. Naming your own part out loud ends arguments faster than winning them.