Help!

So my BF of 5 years now didn't even say HBD to me and is so angry! He's been addicted to pain pills for over 4 years now and with out baby turning 2 in March I can't take this anymore! He's been unemployed off and on since we've been together and I be been working two jobs even before I meet him. His pill addiction has become out of control to where he takes money from my account that I have to pay all the rent and bills... He even took the last of our tax return that was suppose to go to fixing my car and spent it all on pills... That's amour 1000 in a matter of a week! Which it has never gotten this bad! Now he's always calling me nasty names and calling me a liar because I tell him he has no more pills just so he will have some for the next day... But I guess I was wrong in every way for that because the yelling and aggression sure tell another story! I know I need to leave but I have no family here and all my money from both jobs goes to rent and supporting the kids. I just recently looked up employee assistance program but need help and support from women like me who are stuck in this co-dependency... Everytime I find the courage to leave something happens to him and I feel the need to stay to take care of him... I know this is not the man I first met and I know the pills have total control over him! Not even the words "please stop I am begging you for the sake of your baby girl"... "Please do t buy pills because we need the money for rent"... "Think about your baby..."  Now it's gotten so mean and too emotional for me! Especially these past four days... I have never met anyone so mean, nasty, and cold hearted before in my entire life of relationships! Please please help motivate me to keep this strength of leaving and searching for help!