It is indeed very hard to have to wait for someone, usually we don't give much importance to enjoying the time with the ones we love unless we miss them, Your poem reminded me of the time when I was seeing my girlfriend once every 2, 3 months, and you remind me to enjoy having her here now.
Sometimes we give more importance to what is far away than to what is close to us.
True that, as they say, only know you love her when you let her go...