I'll give you an exact definition. When the happiness of another person becomes as essential to yourself as your own, then the state of love exists.
Robert A. HeinleinNever crowd youngsters about their private affairs - sex especially. When they are growing up, they are nerve ends all over, and resent (quite properly) any invasion of their privacy. Oh, sure, they'll make mistakes - but that's their business, not yours. (You made your own mistakes, did you not?)
Robert A. Heinlein