I don't think you are in love with him. I think you are in love with the idea of your first great love. You remember the giddy romance, the first time feelings, and the youth. Those are what you are longing for; not the man. I think you have an idea of who he was and you were and you see it through the rose colored glasses of the past. You've never lived with him, gone through the ups and downs and changes that life brings. Living with someone for years gives you a much different view of love and romance than first love brings. You don't really know this man, you've never seen him in the morning after dealing with a sick kid or sat with him and coffee on a quiet weekend morning. You have the feeling of an old married reaching back for the feelings of the past. They aren't real.