Every agreement you've ever made is really with yourself. If you want a healthy relationship, strong communication skills are a necessity, not a luxury. Trouble usually starts when talking stops. Things come up all the time that have to be worked through patiently and lovingly, even when you're having a bad day. It gets easier over time, but it takes work and a willingness to break up scar tissue and tear down walls.
Communication skills are what make a person a good lover.
Arguing skills are not communication skills. Arguing better than someone doesn't make you right, it just makes you better at arguing. Negotiate a way for everyone to win. Listening is more important than talking. Listen actively and don't just hear.