Why is my husband so mean to me?

I told him that I want a separation ( he just will not change... long story). But anyway we have a one year old and a baby on the way. Me and the baby is staying at my dads for a little. I'm trying to work on co parenting so we can work together as a team and we don't have to go through the system. We agreed. Now he's being a jerk. He's rude to me... he be say duh to me and other things. Very sarcastic. He told me that he put his mom and my mom on the phone to talk about our problems. They was on three way. He's been talking about me. I told him to stop obsessing and worrying about me. He says ewww who would obsessed over you disgusting... or nobody is worrying about you... Like why is he being so mean to me?
Why is my husband so mean to me?
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