Pain of love.

You know what's harder than losing the one you love? Being in their life and knowing that as long as you live they will never be yours.
They know of your love, you know they feel something for you. You know if you try to kiss them, they wouldn't reject you.
If you held them, they'd let you. They just won't let you hold their heart, just like they hold yours. So you decide to give up, you can't leave, it'd kill you.
Which results in you staying and sufering the worse pain. Loving someone who is so close, yet hoping you can slowly burry that love.
It's not healthy, that kind of pain. But you love them, regardless.