What should I do? I have bf problems: me + him + his friend + roommates
This sounds uncomfortable.  Why are you sharing this exact problem?
because I thought you would like this information and need it
I'm sorry you're going through such relationship troubles, but if you two really love each other then his friends and roommates have to go. There's no point in continually having problems when those people are the issue.
It's not like I want those people to go, I just want my boyfriend to understand that they are bad people.
If the people that your boyfriend involves himself with has a negative impact on your relationship, talk to him about your concerns. Just be sure to express how you feel without expectations from him.