Is the girl you're with a good lover? Is she someone really fine? Or do you long for another? Have you somebody else in mind? Maybe your muse is beside you. Or it could be you left her behind. Perhaps you have still left to find her to open up doors in your heart and mind.
Where beauty reigns and lives to give you vision true, so that you'll see the meaning of love and what it can do. An angel waits for you.
But it's all just a waste of time if you only sing lullabies; if you fall asleep beside a pretty doll to whom you are not inclined to bare your soul to in the night when the world you share seems dark; when you only hold her for temporal comfort so your pain won't seem too stark. Let her go. Set free your hearts. Search for love elsewhere. Depart.