Am I being over dramatic?

So my fiancé now we have two daughters together. For the past two years he’s been a family man and hasn’t really hangout with his old crowd. His past friends did tons of drugs and the one that works with him now he is hanging out with him again. Also told me months back he didn’t want to go to one of his get together last because they all do hard drugs. Well fast forward we get a house together and moved out of my apartment and he almost immediately gets this guy hired and starts hanging out with him. I guess I’m just afraid at some point our lives won’t go together anymore. It’s a fear like I love him but his friends and me are so different. Like the lifestyles and it’s just hard to be happy about him hanging out with them. I’m not trying to be over dramatic I’m just afraid of losing the one I love to drugs. I truly feel you are what you around in some cases!