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.
(..) Goodbye ! - You know somebody ? - That's not the point. - Goodbye ! l'll miss you ! - Goodbye ! l will never forget you ! (crowd cheering) Go left, darling. G, G... Excuse me, ma'am. Oh, right here. Hey, how you doing ? (..)1997 Titanic