When is it fair to throw in the towel in love and war?
Your investment in love is not that much different. You've left marks and signs that you were there. A word, a scent, a token, a gesture an image. Some things will be lost but never ever forgotten. You may be preoccupied for a minute, but if even for a second, a memory of what once was will come into play.
Appreciate it, because at that very second, it paid off. Cherish these little things. Collectively, all of the seconds will add up to time well spent.