Am I looking out for his best interest?

Hi everyone, so my boyfriend has a tendency to hang out or become friends with people who aren't too great. Like the people I'm talking about are guys who are disrespectful to everyone including their significant others, who don't have a license, a car, and a job, and have my boyfriend run them around everywhere and pay for everything because he wants to be that guy for everyone. On top of that I can see a change in him completely like a night and day difference from his normal bubbly happy funny self to mean and gets upset easy. I've tried telling him that he needs to be done with them because they aren't good friends and they use him and have even taken it to the lengths to say that it's me or them. The reason why I've done this is because he uses all of his money on them and gives them all of his time, and I'm stuck paying for his bills and I'll be lucky if I can get one day a week from him and he still lives at home until he can get on his feet and his parents even threatened to kick him out if he can't/won't stop hanging out with crummy people. Am I being over controlling? He thinks I am but I feel like I'm trying to help and look out for his best interest.