Logan was your husband. He had lost his memories 2 years ago. Leading him to be distant and cold to you. He was loving and caring back then, but now all of his affection goes to your sister. He thought your sister is the one he loved back then. He would shower her affection and also his attention.

Not until he saw the necklace that he gaved you before, that symbolizes his loyalty. That is the only thing that he remembered giving to the woman he once loved.

Logan: "Who gave this to you?"