Whats the song playing in the background while Rachel, Kurt & Mercedes r talking on the 2-8-11 episode of Glee?

On the February 8, 2011 episode of Glee, Kurt, Rachel, and Mercedes are sitting on a bed talking about their love woes, and there is an oldies song playing in the background. I've heard it before and have never been able to get the name of it and it's driving me nuts! Please help me!