in NY. I need advice.

so I am pregnant and my husband went to the bar last night, I stayed at my mom's with our 3 kids, I kept getting messages about muy husband. So my mom said she would watch the kids so I could confront him. He was with his ex girlfriend(they were together 9 years), he denied it and she had a fit and wade screaming because I showed up. She said she is the reason we're married and she gave him to me(they had been apart 2 years when I met him). He said I had better pack all of my stuff and our kid's stuff and be out of his house or he would burn it all. He went on to call everything but decent and told me I'm a piece of shit mother. BTW it was him wanting another baby, I said I didn't want another after our miscarriage and he kept saying he has to have a boy to carry on his last name. I finally agreed and now he acts like he wants out. I am against aborting it but I feel like it's my only option 😭😭 he threatens that if I leave him, he's gonna have his friends and family (that we don't really see) say that I abuse our children. What can I do?