I don’t want my mom to keep in contact with my ex husband, AITAH?

So I(31f) was married for two years, with my ex(36m) for total of six years. We had what most would consider an easy divorce and sale of the house, and it was pretty much a mutual agreement. When we told my mom about it(last year), she told me she felt my ex was “suffering more” because she thought it was my choice. I told her at that time how that hurt me, and that I wished I had her support as her daughter. For reference, my mom has been verbally abusive since I was child, into adulthood. She cried at the time and told me she was now losing a son, in a sense blaming me. Important part of the story, my ex and I did not spend crazy amounts of time with her or anything, but if she needed help at home he would alwaya go over or for holiday things. Just to point a picture of their “closeness”. So fast forward, she has still kept in contact with him a year later and I’ve told her it makes me uncomfortable because they sometimes talk about me, and also I just feel it’s unnecessary considering the relationship they had while we were together. Today I go to her house and she intentionally left a gift out for me to see she got for him, which obviously sparked conversation. I ask her if she planned on seeing him soon and she said that her and her fiancé planned on getting dinner with my ex and his new gf??? To me, that’s bizarre. She told me they occasionally text and talk on the phone. AITAH for not wanting them to talk?