Old flame could come at a very unexpected time in a very unexpected way. It might have been buried deep down in the heart, might have been forgotten, no, not exactly forgotten. But it might have been carried away by the life that one lives. Once in a while, when life is low, one can pull the flame out from the bottom of the heart and enjoy the beauty of the feeling. Bring back all the memory to the time when everything was so beautiful. Imagination can be very vivid and wild, while the memory would have been stuck in one's brain and stored in one's heart.
Surprisingly, this old flame could also pop up in the real life. The life time that has been spent without his or her existence could make the flame grows even bigger than before. Beautiful memories collide with new stories and experiences. Feelings are shared, curiosity is answered, truth is revealed, secret is unveiled. Then, warmth and comfort run through the heart, creating an ecstatic sensation that one could not help to resist. Too strong and too beautiful to be ignored.
Then what should we do when the beloved one finds his/her old flame. Should we understand it and let him/her enjoy the feeling? Would it be reasonable to be envious? Well, I don't know the answer and still searching for it.
One thing for sure...old flame never dies...