Marshall and Lily are less than thrilled when they hear that Ted's college girlfriend (Laura Prepon) has moved to New York.

Lily and Marshall receive shocking news that has a profound impact on the gang. Ted begins his duties as best man for an old friend's wedding.

Lily and Marshall invite Robin and Kevin on a Valentine's Day trip to Vermont. Kevin and Robin use the trip to talk about taking their relationship to the next level. Meanwhile, Barney realizes he has finally met his match.