Joe Jonas Girlfriends: Demi Lovato

Demi Lovato headed to a treatment center not long after her May 2010 split with Jonas. At the time, before Demz became the poster girl for young women addressing their personal issues head on, media hounds surmised that she had entered the facility to help deal with the pain of the breakup.

In a chat with ELLE after leaving rehab, Lovato quickly dismissed such rumors, pointing out that her problems ran way deeper than breaking up with a boy. The breakup stung but it didn't hasten her meltdown.

For his part, Jonas went about things all the wrong way, issuing a statement and taking "credit" for ending things. That's a you-know-what move.

"Demi and I knew going into our romantic relationship that it may not be an easy one," Jonas said in a statement to Us Weekly. "I realize over the time we have shared together that I feel I care more about our friendship right now. It was my choice to break up, but I love her as a friend. She's been there for me when I needed her. I will continue to be her friend and be there for her."

Talk about airing dirty laundry.