Free-verse

I'm still not quite sure what this really is
They left us alone and now I am his
My puppet strings are pulled by the beat of his heart
If he pulls on them too hard then I'll fall apart

I'm not made of silicone, I'm not made of wood
If he told me to follow him, I'm sure that I would
Puppet strings make me his responsibility
My ties to him are tighter than his ties to me