Gwen Stefani and Gavin Rossdale's split still feels really fresh, but the rocker is coping by channelling her feelings into a new song. Stefani debuted "Used to Love You" at the MasterCard Priceless Surprises in New York on Saturday, saying, ""I just want to share a song that I wrote recently. This song is really special. I think this is gonna be the new single." Though we only have a short video of the new track, we do know a few of the choice lyrics: "I don't know why I cry / But I think it's 'cause I remembered for the first time / Since I hated you / That I used to love you." So . . . this is definitely about Rossdale, right? Listen below and decide for yourself!