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AITAH for telling my ex’s mom why we broke up?

**UPDATE: He came over (uninvited) this morning and we got into another altercation. Police were called and he was arrested. I planned on filing a report after all the advice on here anyways, he just made it easier by being an i__ot.

Thank you for all your replies I didn't expect this to blow up the way it did!** I (27f) broke up with my boyfriend (33m) a few days before Christmas. His mom reached out to me right after Christmas saying she missed me and hoped I was feeling better and that she'd see me soon. I was supposed to go to his parent's for Christmas, but obviously didn't since I broke up with him.

That's when I realized that he must not have told them we broke up, and even lied that the reason I wasn't there was because I was sick. I reached out to him and told him. He said he hadn't told his parents yet and it's not their business.

Fast forward to a few days before NYE and she texted me, asking if I was coming over to their family party. I told her no and said that we'd broken up. When she asked why I told her to ask her son.

He texted me flipping out saying that he'd already said it wasn't their business and to leave his family alone. I told him that *she* was the one who reached out to me, and the only reason I told her was because I didn't want her to keep texting me. I told him I didn't tell her why, and told her to ask him.

Last weekend I heard through a mutual friend that he was going around telling people that he broke up with me because I'm crazy. I was upset that he had to he nerve to be badmouthing me and lying trying to make me look like the bad guy when I was keeping my mouth shut on what really happened. In reality, he got black out drunk and got physical.

So, I told...