Keeping your privacy as a single mom

I am the type of person who when I am done with a relationship, I cut people off and can care less about how they are living their lives. Parenting with the father of my child had been extremely challenging to me given that guy is evil and the more we go the more I despise him. He had been trying for years to find a way to feel in control of my life by using the excuse of us sharing a child but By God’s grace his plans always flop. Our child is growing and has reached the stage where he talks a lot (normal development ). On the few times when I happen to walk by while he is having a convo with his father and I catch glimpse of it, I can hear our child sharing places we have been or things we do and that really pisses me out. Last time he even shared a friend of mine’s name and his number, pretending it was his and the other parent was making him repeat the number so he can write it down. I had to interfere because that was too much breach of my privacy. It gives me the impression that I set myself up to have a spy constantly under my roof forever. I know it’s extreme but I am honestly pissed and overwhelmed. I just want to have my life private, that’s all. I never look at what his father does and know nothing about his life and I honestly care less. You might be under the impression that I am exaggerating and that the father might just be trying to know what is going in his kid’s life but that’s not the case. The father uses every info that our child shares innocently with him to criticize me and badmouth me to people. Worse is my child has speech delay and I am suspecting ADHD as well so a lot of time whatever comes out of his mouth is inaccurate or straight made up lies/imaginary. I don’t talk to the father of my child in any shape of form unless something super important regarding the child. How do I deal with this? I love my child very much but I love my peace as well and hate to be so pissed just because I had a kid with the wrong person. I know there are unfortunate things that one needs to accept with having a kid with someone but I can’t with my privacy. I just wanna live my life with no satan associate being aware of what is happening. Help!!