My boyfriend loves to party, should I be concerned?

So before we started dating, my boyfriend went out to party almost every night and didn't go to school. But then he moved to the town next to mine recently and left all his party friends and ways behind......BUT he loves going up there on the weeknds and alls he does is party with his old friends....Someone told me that these parties get pretty , im talking mad alcohol, weed, heroin, & other drugs.....him & his friends are pretty well known for throwing the parties that they throw...im just scared hes going to have like a drunk hook up or somthing :/I know the girls that go to there parties there reeeeaaaaaal pretty, i want to trust him but come on now.....we all know how guys get when there drunk. I wish I could party wih him, hes invited me, but i cant because my parents are a pair of strict amish natzis (sarcasm). he prefers hanging out with me on the weekends but since i cant...his alternitive is partying.. I just hate the feeling of staying home on a saturday night knowing hes out getting drunk :( I don't know what to do. i dont wanna seem like an obsessive gf or i dont know if i want to bring it up to him cause he will be like "WHAT YOU DONT TRUST ME?" he wil be offended.....I do love him though...