So my mom hates my child's father (although she's never met him in person) we aren't together right…

So my mom hates my child's father (although she's never met him in person) we aren't together right now but we're trying to be cordial for our son. She's expressed how it makes her sick to her stomach when I answer the phone when he calls and if I let him talk to our son. If I see him or let him see our son for a few hours (in a public place) she bitches about that when I come home. She followed me in the store when I Western Unioned my cousin money that I had owed him and she thought it was for my ex and she went berserk! She went through my phone and read our text messages concerning our son while I was sleeping and claimed my dad called her because my ex called him telling him everything we talk about (I know it's a lie because I called my ex and asked him and he said no....if he talked to my dad he'd come out and say it) she's gone so far to claim that my ex made a pass at her sister (my aunt) and that she has proof that he was cheating on me when I was pregnant....but she refuses to show me....I'm honestly tired of all of this and it's too much! I wanna move in with my friend but I'd still need her to babysit (me and my ex both work and daycare is outta the question) ugh I'm just so frustrated and tired of her! I don't wanna feel this way anymore...and honestly even though we aren't together her behavior is making me and my ex closer in some kind of weird way because he's not the one doing all this crazy shit anymore.....it's my mom 😤😖