Something Of Mine

You have something of mine,
You probably don't know what.
I'll let you know sometime,
You'll have to guess a lot.

It isn't gold or silver,
It isn't wealth or fame.
I gave it to you willingly,
I've only myself to blame.

You have something of mine,
Did you take it on a lark?
I'm hoping you keep it always,
I gave to you my heart.