This is by H28 on onedirectionfanfiction.com it's wonderful and I hope you like it as much as me. Recommended for 17+

One thing you should know about Cassie Nectar, is that she has a physco boyfriend. He's possessive, and treats her like a slave more than a girlfriend. So when she takes up the courage to put an end to their relationship - he's not happy. So much so, he tries to hurt her, but she's saved. By the dark haired and blue eyed boy that happens to be Louis Tomlinson. But is she safe?