Who comes first in your mind and thoughts? Hopefully, your partner has the top spot. Do somethig nice for him/her every day. Stay interested in what he/she does or says. Worry more about whether you are being a good partner than whether your partner is being a good mate to you.
Be more patient and kind to the person who means the most to you. Stay open to listening. Try not to judge. Be open to learning more about why you each behave and believe the way you do. Accept your partner. Don’t try to change him/her. Then enjoy each other every day.