Trying to leave my husband with a newborn and toddler.

I have a one month old and 16 mi Th old. My husband goes out from Friday-Sunday sometimes even Monday. Like we don’t see him he goes out to drink and stuff. I told him I’m depressed and don’t want to be with him anymore. I find myself so sad every night by myself with the kids. I look at families and wish I had that. Today his family is over for a party and he’s not even here. My brother in law saw me struggling and is helping me. I thought how pathetic my kids father can’t be here to help his family has to help me. I’d rather do it alone and not have to deal with him. However I’m currently on maternity leave so no income (I’m a nurse) I have no family around really and nowhere to go. He threatened to take my car and phone when I said I didn’t want to be with him. HELP!