Success is really in the mind of the beholder and varies with individual interpretation. What one person might see as a great triumph, another might see as a small achievement. As a relationship counselor, I define success as whatever a couple does to create a happily ever after.
It is the one thing that they both see eye to eye on and the very glue that holds their relationship apart from all the life obstacles that can threaten its existence. It will look different for each couple. How does it look for you? To be able to define it is the beginning of making it come true.