The Surprise Party (2011)

Natalie has a secret. She's engaged to Jacob but has slept with her best friend Nick. Wracked with guilt, she has to decide if it was a moment of weakness or something more. Which man does Natalie love? Can Nick keep her secret? And do either of them realize that Jacob knows more than he's letting on? Their friends have gathered for Jacob's 30th birthday, but the party won't be the only surprise.