All Mixed Up - A Niall Horan Fan Fiction

Dallas Miller and her abusive boyfriend, Jace, have been "working things out" for close to two years now. Hes always getting jealous and mad over every little thing Dallas does that he doesnt agree with, and she's starting to get fed up with it. Well what happens when a friend from her past starts to come back into her life? Will Jace forbid it, or will Dallas move onto bigger and better?
And not to mention Dallass' "old friend" turns out to be a world famous pop star in a number one boy band. Will this better or worsen their friendship...? And what happens when this friend finds out about her dangerous boyfriend, and the things Dallas endures on a daily basis?