I met a little stray puppy today on my way back to my apartment, it was really small and young and hesitated at first when I held my hand out to him.  He eventually warmed up to me and we played around for a while before I decided to go upstairs.  It was almost 2AM and I didn't want to sit around in the dark.  I turned to leave, and the little puppy whimpered and cried out pitifully.  It broke my heart to hear those heartbreaking cries, so I went back and played with it some more.  But I had to go, and I heard the puppy cry as I went back up the stairs.  I looked back and saw it trying so hard to clamber up the stairs to follow me but it was too small to pull itself up the steps.

I had tamed it, and now it was sad that I had to leave. :(  If I hadn't stop to play with it, I would've just been a human to him like a hundred thousand other humans, and my departure wouldn't have meant anything to him at all and he wouldn't have cried.

"He was only a fox like a hundred thousand other foxes. But I have made him my friend, and now he is unique in all the world." - The Little Prince

If you have read The Little Prince, you would know that the little prince had tamed the fox, and made him his friend, and they therefore became unique to each other.  But when the time came for the little prince to depart, the fox said that he was going to cry - because the little prince had become important to him, and the fox was sad that he was going to leave.

I don't know if you would understand what I am saying here.  I should have refrained from playing with the puppy to prevent it from heartbreak after I had tamed it but had to leave it there?

As the fox had said to the little prince, and I quote "You become responsible, forever, for what you have tamed."  I think it's quite true.  Never tame a creature if you are not going to keep it with you forever.  You will break its heart.