Ex telling me he could take meto court

my ex came the other day to see our son of 4 month's for the 15th time. I live with my mom so my ex and I were in my room with our son. I was giving him his time with him as I always try to do (he hands him to me whenever he cries or stirs even the slightest saying he's hungry or needs a bum change- which is false because I do those things right before he comes).

He started to be very aggressive (verbally if that makes sence) his body language was very threatening (i was sitting on my bed and he was standing infront of me). At one point he began to say that he could take me to court and he could take our son. That they would make me pump (our souly breastfed baby)....there's alot more to it but my question is would they make me pump and how do I deal with him being this way towards me? He also threatened that if I had anyone over he would break some legs and if he saw any changes in my son "you'll be the first one I'll be coming to if I see any changes with him. Anything's different that's on you" "better not have anyone around my son or people will start getting their legs broken"

I love my son and I am so terrified that he will try to hurt him just to get me into trouble... he was abusive in our relationship and is still