How do I cut ties with someone who makes me feel emotionally unstable?

My ex’s mother is an amazing person and she loves me a lot. But after our break up she messages me everyday, even though she is very attentive to me and I feel respect to her, it doesn’t really help.

Sometimes when she mentions my ex and reminds me of him, that makes me feel bad cause I really try not to think about him. Reminding about him and the way we broke up makes me feel emotionally unstable and briefly obsessed over our break up again.

And makes me start thinking about something that I already tried hard to put in the past. It does affect my emotional well being, cause I don’t want to think about that anymore, but she messages me everyday, like a good boyfriend, every morning and every day ends with her good morning and a good night and since she is my ex’s mother, it reminds me of him and I don’t want that.

I want to totally forget, which I succeeded almost but talking with his mom doesn’t help. She’s a very nice woman and loves me dearly, I don’t want to hurt her though.

Updates
1 y
Like yesterday she was telling me, my ex wanted to be a monk before meeting me and I obviously made him change his mind by appearing in his life. So she was telling me, maybe I should message him to change his mind about the break up cause I have a big influence on him.

I don’t want that though.

That break up totally messed up my mind. I don’t want to try to reconcile with someone who felt it was okay to lose me. It does affect my emotional well being to even think about that or talk about.
Updates
1 y
She also tells me about his childhood traumas and makes me feel compassionate about him. I don’t want to feel compassionate, he hurt me a lot. He betrayed my trust.

I want to forget and not to think of him fondly. But the stories she tells, makes me feel sad about him, makes me want to hug him and comfort him. Makes me think maybe it was me who wasn’t good enough, but no… I was very loving. He told me that after break up, that he doubts he will ever meet someone to love him the way I did.
How do I cut ties with someone who makes me feel emotionally unstable?
Post Opinion