What should I do when my boyfriend has become an unbearable asshole?

acarpxoxo
I'm a stay at home mom with our 1 year old and in the past 6 months my boyfriend has become such an asshole.. He gets mad at anything I do, holds it over my head that he pays the bills even though I have tried to go back to work and he doesn't want me too ( I have also supported him in the past) and when we start to argue he just calls me names tells me to shut up and tells me to leave! I just don't know what to do anymore. I want it to work for our daughter but I don't think I can take the way he treats me. I try asking him why he is being this way lately and he just says "i don't have to give you any reason.."
What should I do when my boyfriend has become an unbearable asshole?
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