i just CANT take it anymore!

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Hi, my boyfriend has serious drinking problems. he doesnt drink everyday but whenever he has access and money thats the first thing he does. he buys a 1/2 gallon of vodka & drinks it straight. he gets totally smashed. when hes drunk he gets VERY angry & can get violent. he lies about EVERYTHING. i recently found out im pregnant and i've been giving him so many chances, saying if he doesnt stop i will have nothing to do with him. he takes me for granted but says "its just not that easy" i dont know what to do. I dont want my child raised without a father but i cannot take this anymore. i dont know what else to tell him. Anyone else in a situation like this? How in the world do you deal with it?