Missing piece

A puzzle with a missing piece
my search at last had come to a cease
I shoved you in the empty place
just for want to fill up space

You were here and so was I
but you didn't fit and I couldn't see why
I shoved you in too easy I guess
and now our friendship causes pain and stress

I thank you for all the time we shared
I blame you for letting me see you cared
your space will be extra hard to fill
but I don't think someone can or ever will