I don't own the characters. Rick Riordan does.
Piper misunderstands a situation, and believes that Jason is cheating on her. But that's not the case.
She hasn't got the will to go back to camp half blood, heartbroken.
So she goes back to the life she's been trying to avoid. Hollywood.
Yea..ok this sounds like one of the typical "Piper ran away and became super famous and the other come to her concert as VIP and hang out with her and find out its her". But it's not.