"Girls" star must choose between three Goslings -- and three Ben Afflecks
Williams plays Marnie, the best friend of Lena Dunham's character on the Emmy-nominated show
Actor won't even be back for closure in Season 3
What else Sunday's episode of "Girls" had in common with an episode of "Sex and the City"
Lena Dunham's not moping after her break-up at the end of season 1; in the new trailer she's lip-locking with three new suitors