I've told that to my daughters, and one of them has finally learned what I was talking about. She has learned to like, and value herself. She has learned that she must strive to empower herself to accomplish things, instead of relying on others, and sitting by passively. Because she values herself, and likes her own company, she is not gullible, and quick to allow others to devalue her. She's not going to jump into a bad relationship because she doesn't want to be alone. It shouldn't take long for your son to begin figuring these things out.