Analysis of You charm'd me not with that fair face

You charm'd me not with that fair face
     Though it was all divine:
   To be another's is the grace,
     That makes me wish you mine.

The Gods and Fortune take their part
     Who like young monarchs fight;
   And boldly dare invade that heart
     Which is another's right.

First mad with hope we undertake
    To pull up every bar;
  But once possess'd, we faintly make
    A dull defensive war.

Now every friend is turn'd a foe
    In hope to get our store:
  And passion makes us cowards grow,
    Which made us brave before.