Read once in a while.
What you need is absolute integrity. Whether someone is watching or not, you should act in the same way. Who you are should not change depending upon where and with whom you are. Once you have established your way of being, interacting with another person can be a joy.
Another aspect is that if you try to extract something out of each other, and you or the other person does not get what he or she wants, there will be constant conflict.
You get married because you need certain things. If the other person is willing to provide them to you, and you live in gratitude, then there will not be too much friction.
If you accept, respect, love, include, care for, and take responsibility for each other, it can be a beautiful relationship.