If initial physical attraction, followed by positive emotional interest, positive time spent together and positive rewarding experiences is needed for a strong emotional bond, i.e. love.
Then once love has been lost because all or some of these were not present.
Then upon a re encounter, if these things are present then love could develop again between two people.
Is the a reasonable take on things ?
(Then is this only not possible, if there were negatives of emotion or other connections have been formed)