Let Her Go.
Only know you've been high when you're feeling low-Liam: Recently life was just a bunch of ups and downs. Always, seeming like downs, just because he kept blowing things out of proportion. Then, [Y/N] left. That's when he realized it. He was feeling so high when he was with her, but due to tour they were so far apart, and so he was so low. In all actuality, he was as high as he has ever been. Until now.
Only know you love her when you let her go-Harry: Harry was always a sentimental, traditional boy. So, when [Y/N] swore to him that she had to do this, had to Pursue acting, he knew he had to let her go. As reluctant as he was, he decided it was for her benefit. She had to decide on this, and whatever she decided he would be happy with it, for her. That's when he realized he honestly loved her with all his heart, and when she returned, she would know it.
Staring at the bottom of your glass, hoping one day to make a dream last-Niall: Sure, there was the band. That had always been his biggest dream, and it had come true, but everyone knew that would end eventually. So, he wanted something that would last his entire lifetime. But as he chugged down his seventh beer he knew he wouldn't. He couldn't. Not without her.
And you see her as you fall asleep, but never to touch, never to keep-Louis: As he closed his eyes and drifted off into a deep dream state he saw her flitting picture behind his eyelids. As always he ran towards her, wishing only to caress her skin and love her the way he's wanted to all along. He can't, though. She's a fading memory, everyday slipping away further, and he just waits for the day she is fully gone, because, he lost her once, and it's his fault he will lose her again.
You see her when you close your eyes, and maybe someday you'll understand why everything you touch slowly dies-Zayn: Even blinking is a danger, for her picture will appear in his mind and conquer every other thought. She was perfection in every conceivable way. Heaven in a human being. Zayn, though, had ruined his only chance. A night on the road got too much and he had too much to drink and the next thing he knew he woke up with the sinking feeling of guilt and the test he regretted ever reading. It tore his heart to pieces, but, then again, he always did this, didn't he? Killed every chance at happy he ever had.