Why do certain men get a kick out of belittling you,making you feel worthless and are not entitled to anything aswell as saying your a sh*t parent.

I have been called a crap parent and an undermonding parent by my partner because I didn't back him up with our daughter over an incident at school as I wanted find out the full story, I undermined him because our 4 month old was screaming,he picked her up she kicked off he put her down several times, she was aucking on her hand and she settled I told him to pass her to me and Ill feed her bare in mind she had her jabs Friday aswell. Because I went against him telling me to leave her screaming as she angry and had no tears etc and doesn't want anything I'm a crap parent and undermine him. She had trapped wind,needed her bum doing and was hungry she went to sleep,.took 20 mins to calm her but she went to sleep after I did it all. He had a pop at me and told me that he will have control of what happens and to try him as he will get 50/50 of the kids and I can't stop him. Then tonight he's gone on about how I don't work 40/50 hours a week and earn pitence and I haven't earned anything in the house I think I'm just entitled to it. When I do work I work 4 evenings at 20 hours and the other week I work around 30 hours. He has said about what do I have for the kids if he buggers off and takes everything. I said nothing, I haven't been able to save as he just spends and I am paying for his car finance, I pay the car insurance, the rent,council tax, water,phone bill, he only pays his tax and contracts and gets to save whatever money he has, he's on 2,000 a month, ATM I'm on about £1500 and I'm paying everything aswell as supplying for the kids or his wants etc. I'm so depressed and low because of what he has said. If I leave he's taking the kids and I won't be allowed to leave with them, I lost my son because my ex did that and he knows it. I can't leave the house as it's council house and he won't leave. I don't know what to do anymore. I have no escape and I feel so only. When he's angry he trashea stuff around the house or launches it at me. I'm to afraid to get out and have no help