First and foremost, always put your family first. But what would you do if, only a few months before your wedding, your sister disclosed a dark, secret about your fiancé? Would you support your sister and express gratitude for her candor, or would you support your fiancé in opposition to your sister's testimony? An unhappy fiancé is the subject of the story that follows. After three years of dating, the original poster (OP) recently proposed. The idea of being married to the love of his life fi…