Boyfriend and chat rooms..is it ok?

Personally, as long as he's not meeting the girls, or talking about inappropriate things with them, then I don't see anything wrong with it. Look at it this way...at least he's not going out to clubs every night and meeting up with strange girls there...that would be a lot worse. If it really bothers you, then tell him. Ask him to make sure that he keeps the conversation clean, and if he loves you then he will be willing to do that for you.