To my understanding, these sentences below are grammatically correct but they are not natural to your ear, right?
My father always tells me: "Conflicts in a marriage is a sign of normality and happen even to a perfect couple."
... and at the same time they need each other so badly in order to live a happy and a complete life.
Arguments are also required for a relationship to grow and become stronger.
Choose your spouse carefully and reasonably, as I did, if you do not want to have this experience, which is said to be one of the worst and most traumatic of all.