I feel like he didn't do it with the purpose of actually breaking up. I feel like he did it so that I would realize the severity of the situation and leave C and run back to him saying "I'm sorry I ever did that!!!".
The "threat of abandonment" tactic, huh? It is good you know what is manipulative
behavior then and can recognize it as such. Could not let your soft feelings blind you to his character flaws and the basic unhealthiness of playing that move on you.
Love is not enough for a realtionship to be HEALTHY. There must be self-respect (you to you) and respect (him to you, you to him).