I Love You, Man (2009)

Peter Klaven's world revolves around his real estate work and Zooey, his soon-to-be fiancée. After he pops the question, she calls her best friends and they go into wedding planning mode. Peter has no male friends and that poses problems: will he turn out to be a clingy guy, and who will be his best man? Zooey, her friends, and Peter's brother Robbie offer help that results in awkward moments. Then, at an open house Peter's hosting, he meets Sydney, an amiable, low-key guy. They trade business cards, and Peter calls him to meet for drinks. A friendship develops that's great at first but then threatens Peter's engagement and career. Can guys be friends and couples be in love?