From Sebastian Stan to Bradley Cooper, All the People Dianna Agron Has Dated

Agron met Alex Pettyfer on the set of 2011's "I Am Number Four," and they began dating in the summer of 2010, per People. The two kept their relationship under wraps for the most part but had a messy breakup that swept the tabloids in February 2011.

A source told E! News at the time that Pettyfer was "a little controlling" and "seemed really paranoid that she would cheat," which led to their split. Meanwhile, another source told E! News, "They were very in love, they are young, sometimes things just don't work out."