Okay, let me rephrase to see if I understood it correctly. Something happened a year ago which he thinks you have not sufficiently atoned for. He is trying to hurt you, because according to his perception, you hurt him first. He can have his unique definition of dating and you can dislike labels alltogether, but at some point in any discussion, words have to start meaning something everyone can agree on. The way I see it, you are having an ongoing discussion on the boundaries of your relationship but to avoid losing face, are pretending not to be invested in the outcome at all.
"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.