My boyfriend brought me my car.... But stole the battery

This is an update. So I made 2 post but my ex called me saying our 17 year old son got raped by his friend... They were at the hospital performing a rape kit which the doctor apparently didn't even need because he could tell just but looking. My boy had to get stitches. My two kids live with my ex because they wanted to stay at their school but I moved. I still see them. My boyfriend didn't want me going to see my son because he didn't want me spending the night with my ex. He wouldn't let me use his car which was in my name that I pay for. He even hid my keys. I took a Uber and he kicked me out. So... I demanded my car back... My ex has let me stay until I figure something out and our boy has needed us both. He at first would poop because it hurt to go and wipe so me and my husband got him stool softeners. Me and husband eventually had to team up because he was in so much pain and would cry going number 2 so we would go to the bathroom with him and he would be screaming in pain and me and my husband kind of had to use a peri bottle on him and wipe gently because he would be gripping something crying. Before anyone says anything we are his parents and he needed it. It may have embarrassed him a lot but he knows he needed the help. Well I finally got the balls to ask my ex boyfriend for my car back since he kicked me out. He said okay. I wake up in the middle of the night last night. I've been sleeping in my son's room with him at night to help him through this and my ex husband said my ex boyfriend was at the door. He had gave me my car keys and went in his friends car to leave. Well this morning my car wouldn't start.... My ex husband popped my hood.... He stole my fucking car battery....

Edit: I'm not planning on fighting him for it. If that was him wanting the last fuck you he can have it. He gets the last word. I can get a new one and yes like someone commented. I have bigger issues going on. Just wanted to vent that.