Stealing My Heart

I didn't really know where to put this one so tell me if you have any better ideas.

You've stolen my heart,
And won't give it back,
Forced yourself in,
Through a tiny little crack.

At first I fought it,
But love is too strong,
I was too weak,
Now my heart's where you belong.

You've got exactly the key,
To unlock my heart,
Deep down I knew I loved you,
Right from the start.

You got in through a window,
On the top floor,
I was with you for a couple of hours,
But I wanted more.

You crept along the landing,
Snuck down the stairs,
Jumped into my life,
Caught me unawares.

You've found the key,
And let yourself in,
I so want to tell you,
But don't know where to begin.