Marriage isn't "I promise to love you until I stop loving you." It's "I promise to make a conscious decision to continue to love you even when it's hard because I'm aware no one is perfect, but you are worth it."
If you want to be happy, you need to stop chasing happiness. Happiness is a byproduct of doing things that are challenging, meaningful, beautiful, and worthwhile. It is wiser to spend a life chasing knowledge, or the ability to think clearly and with more dimension, than it is to just chase what "feels good." It is wiser to chase the kind of discomfort that only comes with doing something so profound and life-altering that you are knocked off your orbit. It is wiser to tip the scales over rather balance things you don't like only because you believe balance will make you "happy." It is wiser to do things that are hard and make you feel vulnerable and raw than it is to avoid them because comfort makes you feel temporarily, fleetingly good.
If we approach adversities wisely, our hardest times can be times of greatest growth, which in turn can lead toward times of greatest happiness… ...Learning to endure times of disappointment, suffering, and sorrow is part of our on-the-job training. These experiences, while often difficult to bear at the time, are precisely the kinds of experiences that stretch our understanding, build our character, and increase our compassion for others.