You’ve to be there, present in every moment, living it to the fullest. Because, if you don’t, you won’t be able to relive it while you sit at your favorite spot looking at the stars and the moon, enjoying the cold breeze brushing your face.
Also, you’ve to understand that you don’t have to be completely attached to someone or some moment because then you’ll be stuck forever in that moment; unable to come out of it and experience something new and better again.
Live the moment, love the moment and learn to let the moment go too.
(Only at the right time.)