What should i do? Im clueless. Please Help Me.?

my boyfriends of a little over a year broke up with me when he started hanging out with his new friend brian. ive always known that my boyfriend smoked marijuana, but i accepted it, because he didn't smoke a lot. ever since he started hanging out with brian he smokes all the time, everyday, all day. brian is getting him to do acid. almost every night that we don't have school, sometimes even when we do, my boyfriend will drink alcohol, until he passes out, or throws up. a few friends of mine are trying to help me come up with a way to get him help, without getting him into a lot of trouble with the police, he has been on probation once already, with a large amount of community service, because of having a marijuana leaf in a book at school, they also took his pack of cigarettes. also since he was in second grade he has ben having sex. and when we broke up it was so he could be with one of his 'sl*ts' we have been apart, just 'taking a break' for about a month, and he is already on his second 'sl*t' i want to get him help, but i don't know how, without making him hate me, because i truly care, and love him, anyone can see that he still loves me and cares about me, but his thinking is all messed up. he needs help, he needs to change his ways, he is ONLY 16. im only 15, this shouldn't be happening. his mom doesn't like the things he does, its obvious in her face, but she supports him by buying the alcohol and giving the money for the drugs for fear if she doesn't that she will lose her son. im scared and confused. i just want the caring, loving, smart version of him back, and im sure his family and friends would all agree, even though alot of his family memembers(his brothers mainly) use marijuana, and so do some of his friends, but the way he is now, he acts like a jerk to everyone, even if its not directly to them, he still does it. please help, any ideas on what to do?