The Beholder.

Since we've been together, you've only made me smile.
Brought me pure joy.

You've never played me like some silly little toy.

You've made me laugh until I cry.
To be happy with you I don't even have to try.

You've brought me so much change.
Especially for the good.

To see how much I love you, I wish you could.

The point is you are the beholder.
The beholder of the key.

This key that you hold, is really important to me.