i need advice

i've been dating my boyfriend 9 months and he knows i am against drugs. at the beginning of our relationship he lied to me about doing them. then i gave him another opportunity to be honest and to tell me if he was going to get high so he didn't have to lie to me about it. but whenever he gets high now he expects me to care for him and bring him drinks and get him gum and eye drops. i don't feel appreciated and i don't feel like he values me. what do you guys think about the situation ?