Argue with self-awareness, compassion and empathy.

Arguments will happen and I hope they happen often because that means you are being honest, but you should always do so with empathy, compassion and self-awareness because your goal in a relationship is not to win, your goal is to resolve the issue.  One person winning means the relationship losses, a good argument ends with a hug, a feeling of relief and an understanding that something will change for the better on both sides.