A Successful Relationship

There is no correct formula for a successful relationship. Because being successful over here is not a one time thing. We will always be learners, will always be in process of making relationships better and better. For even if we arrive at a stage where we find relationship between two people perfect, impossible to find a flaw in; the very next moment we will find one of them or perhaps both of them changing and if people are not the same, then where does perfection in their relationship come from?