If you think that the charm in your relationship always remains the same as the initial beginnings of your bond, then you must come out of that la-la land as soon as possible because the word eternity without efforts is illusional. And unfortunately, most couples don't make efforts to maintain the charm in their relationships. This is the very reason why people often complain regarding their happiness and satisfaction levels with their partners after spending a certain period.
Efforts are the most crucial elements that are needed to flourish a relationship. It's like watering a plant, if you don't provide proper nutrients to a plant, its growth gets gradually reduced and one day it vanishes off. So, if you stop making efforts, you miss the inspiration to appreciate your partner and in the end, you feel like getting apart from the person whom you love. No matter what kind of relationship you are in, your daily routines may make you feel monotonous at one point which indeed demotivates you to recognize and realize your partner's existence with love. So, you need to make a few efforts to transform the daily routine of your relationship into something interesting.