Om Swami
What are the basic truths I need to accept to make my relationship work?
Three truths for a good relationship
You cannot make a relationship good by negating your desires, and you cannot change the other person. Your state of happiness is your creation, and the place to go is inside.
In summary: you cannot make a relationship good by denying your desires. Second, you cannot change the other person. Third, your state of happiness is your own creation.