What happen to Emily at the end of A Rose for Emily?

She used the poison to kill her "husband", although we are not sure if they married, because she found out that he was gay. Another possibility is that she, being a daughter of her father, agreed that he was not good enough for her and decided to kill him. She then lays with him in bed up until her death to keep him with her, although dead. It is a weird story. But basically it has to do with her social roles constraining her from being her true self.