People use the terms 'primary', 'secondary' and 'tertiary' to mean rather different things, and some don't like them at all, but due to time and energy constraints, possible additional partners rarely are all primaries, live together in the same house etc.
"Resentment destroys more alcoholics than anything else. From it stems the root of our spiritual disease."
"In dealing with resentments, we set them on paper - list people, institutions and principles with whom you are angry. Ask yourself why you are angry."
"In most cases it was found out that our self-esteem, our pocketbooks, our ambitions, our personal relationships, including sex, were hurt or threatened. We were sore, burnt-up." Alcoholics Anonymous, 64-65.