Louis didn't understand why Liam had left. He honestly thought they would last forever. He thought it'd be different this time if he opened his heart one last time and maybe if it wasn't, he'd be able to deal with it because if he dealt with it once, he could do it again, right? Wrong. The heartache he felt then was nothing compared to the heartbreaking pain he felt now that Liam was gone. And what makes it worse is that Liam didn't give him a reason, a true reason. Why did he leave? But Liam did have his reasons for leaving. They had nothing to do with Louis but everything to do with him at the same time. Liam was just trying to protect Louis, he had never wanted to hurt him... That's why he had leave, just in case.