I was shopping in a J. Crew outlet when I heard this great song. I would say it's more of a pop song and it;s sung by a female. The only lyrics I remember were" tearing me up" "with/got a new girl" and it was in the chorus. The song was about a girl talking about her ex-boyfriend and how seeing him with his new girl hurt inside, somewhere along those lines.. It's has kind of a bouncy tune and fast paced. Not anything like a sad song. It was super catchy and I've been dying to know the name.