They were married. But for how long? She might've already been pregnent.
Who says they got married. She might've died be4 the wedding.
Here are my thoughts on each of the listed heroins.
Rinoa: Represents the "love wins all" them of FFVIII.
Aeris: Represents a highly retarded world of dumbases.(not the Ancients, the people who like her over Tifa(
Garnet: The strongest out of all the characters. She represented overcoming the need to rely on others.
Yuna: Well, her quest being a sham is the whole point of the game. Or, maybe a major point of the game anyway.
Tifa: A friend of Cloud's. She wanted to aid her
so she helped him.