"Love is not about finding the right person, but creating a right relationship. It's not about how much love you have in the beginning but how much love you build till the end." -- Author unknown
This is so true. After many years it doesn't matter how much you loved each other in the beginning, it's how strong of a foundation you built with each other. Similar to a house or other building - if the foundation is not sound, it's not going to hold so the slightest bit of storm or hardship is going to do its damage and sooner rather than later, it'll give out. If the foundation is strong, it'll weather the storms.