Yes, relationships can be worked on, and sometimes these efforts are successful. But love is not an effort; it cannot be worked on or deemed a success.
Whatever is achieved through effort will require more effort to protect and maintain.
Some men believe that if they work hard their diligence will produce happiness in the future. But how can this be? No one in human history has ever been happy in the future.
One indicator of a loving relationship: No thought or talk about the relationship.
We are not changed, healed or transformed by making an effort. Even as a concept, efforting-ing is exhausted. Change happens when we drop the conceit of doer-ship, expunge ambition and welcome what happens.