Mom harassed my cousin with messages because we’re close

My cousin and I are fairly close and we talk almost everyday.

My cousin has a daughter and my mom asks me for updates about my niece, WHICH TURNED OUT TO BE A TRAP CAUSE STUPID ME WOULD GIVE HER UPDATES.

She then messaged my cousin because she found out I heard about my aunt who was telling everyone that I was pregnant (I’m not) and that I was a mistress (I’m not) because we fought and I angrily let it slip, my mother then admitted that she knew and was suspicious about me too.

My cousin called me and told me that my mom had messaged her and it was hurtful and it seemed to have something to do with me, my cousin wouldn’t show me what it was because she said it could trigger me.

I hate how she ruins all the relationships I have with people closest to me, including my now ended marriage.

I’m tired and I’m just sick of her attitude.