I think my so is behaving like an asshole
Why would you want to give that person an even lower opinion about him.
I feel sorry for abusing him but I want to hurt him even more
You should keep that to yourself. Telling your SO that will just make everything worse.
I think it is time to break up with him.
You have a right to end a relationship but there is no need to be hurtful for spiteful reasons.