The loneliness is when you pick up and move, even if you are not originally from that place, and you have some memories that you want to embrace. Having a life in transit, I feel like you are always looking out the back window.
We can also allow our Soulmate to pass us by,without accepting him or her,or even noticing. Then we will need another incarnation in order to find that Soulmate. And because of our selfishness, we will be condemned to the worst torture humankind ever invented for itself: loneliness.
At the enchanted metropolitan twilight I felt a haunting loneliness sometimes, and felt it in others -- poor young clerks who loitered in front of windows waiting until it was time for a solitary restaurant dinner -- young clerks in the dusk, wasting the most poignant moments of night and life.
…Forgive us, O Lord, we acknowledge ourselves as type of the common man, Of the men and women who shut the door and sit by the fire; Who fear the blessing of God, the loneliness of the night of God, the surrender required, the deprivation inflicted; Who fear the injustice of men less than the justice of God; Who fear the hand at the window, the fire in the thatch, the fist in the tavern, the push into the canal, Less than we fear the love of God.
Maybe a first love exists to reaffirm the best parts of yourself, the choices you made when you didn't worry about the consequences. Maybe a first love exists to remind you to be brave in the moment, to stand up for your feelings, instead of shrinking back in the face of potential loneliness.
You travel life has the aspect of a dream. It is something outside the normal, yet you are in it. It is peopled with characters you have never seen before and in all probability will never see again. It brings occasional homesickness, and loneliness, and pangs of longing ... But you are like the Vikings who have gone into a world of adventure, and home is not home until you return.