Jealousy (A Niall Horan Fanfic)

Kiara was very happy, with what she had. Her best friend, Nikki.. Her perfect boyfriend, Louis Tomlinson.. And the boys being the best friends she could ever have. There was just one problem.. When Niall Horan, her old crush, gets a girlfriend she can't bare it. She can't even think of seeing him with someone else. And to add up to that, Niall's girlfriend, Diane, is grabbing every chance to annoy and hurt Kiara. What will she do?