Venting I need help 😭

So tonight I had a falling out with my less than a month old son's dad. Apparently it's illegal to record someone whose being abusive to you so he grabbed my phone from me and threw it on the ground and it's broke now. Luckily I have a back up phone which I'm using for now. This dude threatened to file for full custody of my son. All because he took my son upstairs to visit his family members who he sees everyday I wanted my son back. He has a criminal record and has former use of drugs. His mom told me they would file for full custody if I'm an unfit mother. I haven't even done anything to be an unfit mother. Even if my depression makes me an unfit mother he is the one putting me thru all the depression. He threatens that I can't leave bc it's his son too, I'm not allowed to do anything without his permission which I never even get because his life and family is somehow better then mine? I feel trapped and honestly I don't trust these people at all. It's making me miserable being around people who would turn their backs on you in an instant. I just want to take my son and go. I had so many screen shots and evidence of how he's treated me over time and all the new pictures over the past 3 weeks of my son and me are just gone. That hurts the most those pics I will never be able to get back. He's on probation and is scared I'm going to send the info to his probation officer but either way he has tampered with my evidence that I no longer even have. He was being abusive and I do believe I'm allowed to have that as evidence on my phone. Anyways, I'm not full of money like these people are so there's no way I would get custody of my son, period. I'm fighting a loosing battle and now I'm so far depressed I have no idea what to even do. I've become a mother to my son who I love dearly now I'm at the point I'm going to loose him bc I'm hurt and don't know how to hide every emotion I have. It's hard and idk if I can even do it anymore. I don't want to be his bitch who he has control over. I'm just done.