Crying from loss, pain, sorrow and even joy. But finding yourself crying from seeing someone smile? Someone is out there who hasn't smiled in a while and when you finally see them smile you let out tears because that's what you've been fighting for, for them to be happy.
To see their cheeks wrinkle, their eyes to light up and their smile sneak onto their lips. To see genuine happiness in someone who you know deserves it. When you know that's how their supposed to be.