My ex belittles me and is a self righteous bastard! We got into a fight today because I'm requesting…

My ex belittles me and is a self righteous bastard! We got into a fight today because I'm requesting child support and he went off on me like usual in his self righteous ways. And he saids he wants 50/50 time with him. When the guy has come to see him 9 times since he's been born. And he's 5 1/2 months old and breastfed but he thinks he can take him for every other week. Over my dead body. He can have him every other weekend when he's older. I give him every opportunity to come and see him and spend time with him and he doesn't. He just talks out of his ass and makes himself look even worse than he already does! He's a asshole and this baby is mine and he can go to hell. He's emotionally and mentally abusive toward me and I'm sick of it!