In Shakespeare's Hamlet, what does the Player King reveal about love and success?

I think he basically reveals that love is just a word, four symbols put together, to point at something --- but we can rarely, if ever, agree on what it is that it points to.  At the height of infatuation, we think this is what "love" refers to.  But the very intensity of this passion often causes it to burn out quickly and what we thought was love is gone.  When people say "I love you," who knows what they are talking about:  passion, sex, self-sacrifice (greater love than this no man has)?

So often love ends ...  because it was something other than love that we named "love."  Shakespeare thinks that love doesn't change.  In Sonnet 116, he writes "Love is not love/ Which alters when it alteration finds/Or bends with the remover to remove."  It doesn't depend on passion; it doesn't depend on success.  This is not to say what it is, just what it is not.