Joe Jonas wants to take his relationship with Gigi Hadid "to the next level". The singer is "in love" with the blonde beauty, but friends fear he is set for heartbreak as she only wants to "have fun". A source said: "Joe really wants to move forward to the next level -- being a serious boyfriend/girlfriend. But she says that she just got out of a relationship so she's not ready -- but he's in love with her. "He sends her flowers and says how hot she is and talks about her all the time. "He thinks she's gorgeous and wants to date her exclusively. She just wants to have fun and casually date. His friends think she's going to break his heart."