Yes, because you don't know them. You idealize what they are like and how they would react, feel, kiss, etc. Then when you have them, they WILL NOT meet your ideal. That's called infatuation, a type of psudo-love. Friendship is also a type of love. There are ALL KINDS of love out there. Then, there is the I can't have you love manifesting either, I love you, but I can't have you in a romantic capacity, so I will have you as a friend, or, I love you but can't be with you for whatever reason. Decide on which capacity you want this person in your life and strive for that. If you can't have him in any way save your boy friend, then move on. We all have to learn that lesson sometime. I think I am getting schooled in that now. You aren't alone, m'dear.