It is not the love of childhood sweethearts, but they have been together for thirteen years. It is love, but there are always people and things of this kind breaking into life, so two people who are obviously in love have known each other for thirteen years, broke up twice, and been together for four years, from being honest to lying.
Purpose: If you are in love, don't hide or deceive. Only by being honest with each other can the relationship last long.