I've had this question from multiple females in ailing relationships recently. Seems an expectation of men that no matter the difficulty, they will keep fighting and come back for the woman... undying love.
... and so I ask about staying power...
Imagine your beautiful mate is everything you wanted and easy, except one thing. Each day, they prick you with a small needle, not worse than a bee sting. It's ridiculous, but it's their way out outletting internal grief and you accepted their cultural behavior because they are perfect in every other way.
How many days of that can you endure.
This is the basis in some cultures, of torture...
Obviously there's a point to the analogy. Relationships have some pain which we need to endure, hopefully a lot more good and you learn to work together effectively to make each others lives better, more fun, more joyful, fulfill needs of each.
...
Love seems a bit alchemy doesn't it, and maybe a notch fickle. It requires great communication, patience, giving, receiving, accepting. It's alchemy cooking...