This is why band members shouldn't date. Look what happens. it gets to awkward when they break up, its too hard to work together. This is the main reason I think Josh is leaving, and with Zac being his brother he is supporting him. I think Zac would feel to awkward without his brother with him, in the band so he decided to leave with Josh.
Oh and to all the stupid people (not here but twitter, wherever) calling Hayley a bitch, and saying she only cared about herself in the band, screw you. You aren't part of the band so you don't know whats going on. Hayley and Josh dated, and broke up, but they are together every night on tour. Do you know how hard that might be for them?? If they were real Paramore fans, they would be supporting the ENTIRE band. Hayley seems like one of the most down to earth people out there. I bet she is real upset the them leaving.