Because, at the end of the night, when you are lost in a muddle of dirty glasses and crumpled sheets, only you are left. Because when you sit on the floor, glass fragments your only clothes, the only voices talking to you will be the ones left in your head.
You don't want to lie to those voices. Those voices are yours. They control you. Everything you do. Everything you are.
And they can tear you apart.
Don't lie to this voices in your head. They can hear you. They can here you crying for help. They know when you are pretending. That's why, each time you tell yourself it will get better, you fall harder, deeper. That's why the more you pretend you are fine, the more you lose yourself.