your infance was very traumatic, your parents didnt love you, and they punched you, then you conviert in a cold person, without emotions, but that change when you meet Sherlock. He was in love with you, and you with him, so you and him start dating and married. Tonight you are seeing you in the mirror, thinking who you are, and why do you exist, grabing a knife, but Sherlock run to you and hug you, saying

"Love...no...please no..."