Boyfriend and drugs

My boyfriend and i have been dating for over a year and I knew before we started dating that he did drugs but he stopped doing it because he knew I didnt like it... But now a year on he has started doing an array of hardcore drugs again and he tells me everytime he does them so he doesnt lie about it but it makes me want to throw up I feel so shit about it... Anyone hve any experience or advice??? We are both 22