Guys, this is going to be a real quick favor.. My best friend

Who do you think you are  ?   Runnin' round leaving scars,
collecting  your  jar  of  hearts,  &  tearing  love ♥ a p a r t..
You're gunna catch a cold,    from the ice inside your soul;
Don't  come  back  for  me..     Don't  come  back  at  all...
Who do you think you are..?