He is the sweetest man: warm, witty and intelligent. He cares for you deeply and while you care about his feelings, you are not romantically in love with him, and you are not happy. The relationship has the feeling of siblings or friends, or worse, roommates. The passion is not there for you and it makes you sad, but you realize that the longer you wait, the more you will resent this dear, sweet man. You have to end things, but you do not want to hurt him. How best to gently end a relationship then?