The following result is obtained by our expert's opinion:
In India and especially in Hinduism, the concept of soul-mates are always been promoted to make rest of the things justified. With the context of soul-mates, they justified following unjustified things -
a. Women were not allowed to choose their husband.
b. Men keep the decision to marry or not.
c. Women were not allowed to even look at her husband before marriage.
and other unjustified cases.
Hence, in Ramayana mythology, the concept is prevailed and promoted to deliver the context.