Scared my boyfriend will turn into a dick 😕

My boyfriend has recently made friends with this new group of lads who don’t have the best reputation, I’m scared that he’ll become like them and start to treat me like shit. I think that because he’s with a group of ‘cool’ people it means that he has to become ‘cool’ but cool to them is treating their girls like shit and just being plain old fuckboys.

He’s already starting to be influenced by them as he’s not the same in the relationship as he was before, he’s a lot more meaner and disrespectful. He used to completely adore me but now that’s seem to have disappeared and idk what’s happened, he’s also started to talk like them and have the same mannerisms. He no longer seems to have time for me as he’s always on Xbox to his friends, he ignores my texts and never makes plans anymore either and when we do make plans he only wants to spend time together for an hour or so

I’m so scared and idk what to do or who to turn to, I already talk to him about the things I want to improve in the relationship but I just don’t want to keep going on at him as I don’t want him to be put off me

Can someone please help? 😞