I chose to use simple words here, because there is really no explanation for some things, since we are only human and cannot comprehend certain things or feelings until we have experienced them.
This poem reflects the struggle between two people from first-person point of view. Within these verses, a path of disillusionment and abandonment is made by the "other person" spoken of, and the first person telling the story has been broken by the selfish acts of the other. The shards of glass represent the pain inflicted upon the storyteller, or sufferer, and walking on them is like walking through them, or making it through his/her problems with the help of a selfless person.