Every couple is unique and special but their problems are not. At the core of every failed relationship is the assumption that the two people involved will not face the problems others do. In fact, people are naive to the extent that they believe there won’t be problems at all.
Relations everywhere, despite your singularity, have the same DNA. If someone were to compile a list of all the reasons why historically relations have failed, the result would be a very small set of obvious looking problems. Love may succeed because of un-thought of reasons, but it usually fails around very common ones. As morbid as it seems it is indeed good news. This means with proper precaution and preparation a relation can be fortified against the most probable causes of its demise.