He said he broke up with his last girlfriend because she was beginning to 'crowd' him. [=she was not allowing him enough privacy and independence]
Her parents are concerned that she's been hanging out with 'a bad crowd'. [=with people who do illegal or immoral things]
He was never one to 'follow the crowd', so we weren't surprised when he dropped out of college to start his own business.
(..) Okay, thanks for the help. I can take it from here. Hey, you over grown weasel . Wait till we get down there. The whole South thing is way out. The heat, the crowd. This great. You and me, two guys knocking about in the wild. No, you just want a bodyguard so you don't become somebody's side dish. (..)2002 Ice Age
(..) Hey, do the world a favour! Move your issue off the road! If my trunk was that small , I wouldn't draw attention to myself, pal . Give me a break. We've been wandering with our babies. Go ahead. Follow the crowd. Be quiet when you're gone. Come on. I'm up, I'm up! Rising sign, everybody. (..)2002 Ice Age