Measure the success of a relationship by its depth, not its length
Plenty of couples are miserable and trapped in long term relationships. Just staying together does not make it a success. Redefine what measures success by changing your persepective to see the depth of connection, understanding and love in the relationship.
Relationships have a natural harmonious course that they run. They may be there for a reason, a season, or a lifetime, but trying to force-fit a relationship into a mold that it doesn’t naturally fit is a recipe for pain. Be in right relation to what is natural. Don’t try to change one thing into another. Be open, honest, and call things straight. Focus on successful mental and emotional connection depth rather than staying together at all costs.