Who is Joe Jonas Saying "Sorry" To?

Oooh, mystery!
Joe Jonas talked to E! Online about his solo album, and dished that one of the album's songs is super personal!
"'I'm Sorry' is really honest. It's saying, 'I screwed up.' I didn't cheat on the person, but just I messed up and I wanted the person back. I'm just putting it all on the table saying, 'I'm sorry. I wish I could have you back,'" Joe said.