Undoubtedly who does not know how to receive love, who is not able to love intensely, does not value or does not respect the feelings of the other person is the one who loses in a relationship, perhaps because of immaturity, fear of commitment or simply does not know how to love, maybe in the course of his life lose the motivation of life that only gives love and realize that he has lost the opportunity and the joy of giving the best he had to give, will only take with him the nostalgia for what he has lost for having failed to others and primarily himself.
Remember that the success of a relationship comes from loving yourself first, which will allow you to be able to love others and offer others and the universe the best image of you.