give your characters exes.
give them a variety of exes. give them relationships that shaped who they are but did not last. give them people they tried very hard to love but it didn't work out. give them situationships that taught them things. give them something deep that was real but could not endure. things that hurt. things that ended amicably. people with whom hot passion cooled to warm affection and became undying friendship.
no more first and only. give me the context of what made them know the next or one after was final and right.














