Leaving him

I’m officially done, he leaves me to go get drunk with his cousin and do other stuff. His cousin is known as a drug addict might sound rude but he is. Now my bf left me alone at the house to go drink. But I know he does other stuff cuz he comes back home different. So I’m leaving tomorrow morning. I’m sick of this. I tried to give him everything. NOT TO MENTION HE USES MY MONEY!!!!