Starrysky, you made a mistake, you are human.

The good thing is that you recognised very quickly this was a destructive pattern and you got away from it quickly. Yes it would have been better to do this without engaging with him but you were feeling hurt and struggling to cope and so you reacted.

Is this a person you can go no contact with in your life? (Is he unconnected with other areas and friendships in your life?) If so I really recommend that you do that - no apologies, that will just reopen the interaction.