Because he had never abandoned himself, he could miss Beth and grieve for her without feeling abandoned, lost, victimized and alone.
Gary, on the other hand, was not fine, no matter how much sadness he released, because Samantha had been his Source of love, his Higher Power. He had handed to her the job of defining his sense of self, so when she left, all he could feel was abandoned. Gary had handed his Inner Child ? his feeling self ? to Samantha. He had made Samantha responsible for his feelings, so when she left, he felt like an abandoned child. His Source of love had gone away.
Because Frank knew how to love himself, he knew how to love others. Within a couple of years, Frank was in another loving relationship.
Gary found another relationship within six months of losing Samantha, and six months after that was again alone. Until Gary decides to learn to take responsibility for his own feelings and needs, he will likely continue to lose relationship after relationship, and continue to be stuck in feeling like a victim of the women in his life.