Make sure you are effective listener. You need to make sure you let your spouse speak without interruption. Listen actively, don’t just think about what you are going to say next while they are talking.
Learn your spouse’s communication methods and adapt to them. Are they a talker? Do they shut down when things get heated. You need to learn and talk about how you communicate and “teach” you spouse how YOU communicate.
Don’t wait until things get heated to have this conversation. Do it when things are going smoothly. Communication is not an easy topic but you can do it you purposely work on it!