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.
(..) It's none of my business, but isn't a guy who can't speak in front of women gonna hold you back a little? He'll be okay once the women are mixed into the crowd. He only has a problem when they're one-on-one and smell nice. Thanks, Raj. It's vanilla oil. I was actually the one who noticed. (..)2008 TvShow: The Big Bang Theory Title: The Bat Jar Conjecture Season: 1 Episode 13