AITA for not talking to my mom’s partner?

I’m 19f

Some background info – my mom and dad separated in 2023 when I was 16. My dad was a narcissist and did everything bar hit us. He treated my younger sister (14 now 17) and I horrible and my mom even worse. Her way of coping was taken her anger out on my sister and I. When we finally left my dad and moved house, things became so much better. I was finally happy being out home.

About two years later I came out as and a few weeks later my mom came out as gay. A few months later she started dating a woman we’ll call “Sandra”. After a couple months of dating, my sister and I met Sandra. She seemed very nice and my mom was happy. But after two months my mom and Sandra got into a bad argument and broke up. My mom kept calling her a narcissist and they never communicated properly. I obviously unfriend Sandra on Facebook.

The next day Sandra sent my mom flowers saying that she wishes her all the best in life. They met up the night and got back together. I had told my mum that they’d just end up back together and low and behold, I was right. I was annoyed that my mom was being manipulated into restoring the relationship. Sandra sent me a message saying she’d understand if I was angry and just protecting my mom.

My sister and I buried our thoughts and frustration and pretend to act normal around Sandra for our mom’s benefit. When Sandra would come round our house, she would insert herself needlessly between my sister and I and our mom and kept trying to buy us off with gifts.

Five months later, they get into another argument caused by Sandra and my mom broke up with her. My mom again kept calling her a narcissist and all her friends agreed. The same as before, the next day, Sandra sent flowers. They met that night, much to my disapproval and telling her they’d just end up back together. I was right. She invited Sandra over and said if we weren’t happy with Sandra to stay in our rooms and not talk to her. So I stayed in my room and didn’t talk to her. I did this every time she came over.

My mom snapped today and said I’m being immature and rude that I was treating Sandra this way. I argued back and said that they’d broken up twice and had called Sandra a narcissist. She said it was none of my business. I replied that it was business as you keep involving me. She said that I should be curtesy as she had to put up with all my shitty boyfriends. I snapped and said “but I never got back together with any of them, did I?” She walked away and has been giving me the cold shoulder.

Was I in the wrong? Am I the asshole?

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