Typically "bros before hos" means that you side with your guy friends over your lady. However, most guys eventually outgrow the whole (sexist) "bros before hos" thing. If they don't, they usually stay single. They also outgrow the friends who do nothing but party. At least they do if they want to get anywhere in life.
Sure, they may keep in touch with a couple of their hard-partying friends. They might occasionally hang out with those friends if they feel nostalgic for the old days. But someone who does nothing but party becomes a drag once you're an adult with a job, a wife, and responsibilities. It's possible that he'll phase out the friends who are really trouble over time.
It seems like the problem is more that you don't approve of his friends. Which is fair. Maybe he has some lame friends. Are they really endangering his life, or are they just wild party dudes who are reckless with their own lives? Is it that you'd rather he not associate with these guys once you're married? If so, you need to tell him. Don't tell him he can't hang out with these guys. Let him know that you're concerned about his safety when he's around Steve the drunk and Dave the pothead. Telling him they don't have his best interests at heart probably isn't going to work. That's something a parent says. Just tell him that they scare you, and you're worried about him. If he loves you, he'll realize that you're only commenting on his friends' behavior out of concern for him, and do whatever he can to assure you that he will be okay while around them.
Is your guy partying 24/7 with his friends? If so, then maybe you need to evaluate whether he's really someone you want to marry. But if you just don't like his friends, well that's a conversation you need to have. Because it sounds like you want him to ditch his irresponsible friends. And he may not be ready to do that.
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