Love?

Dark, shows the light.
Light shows the dark.
No one can unlock this broken heart.
The lock is rusty and old. The man it's in is mean and cold.
He lost his ability to love when you walked away. He cries in the corner everyday, waiting for that day you come back his way. He encloses himself in his house, his only friend is his pet mouse.
Please help him get out of his house, unlock his broken heart, make him enjoy the light and destroy the dark. That person is me, now since I have you I can only love. And there is now no more dark!!