No relationship can stand the test of time without the right amounts of communication, trust, compromise, efforts, time, compatibility, loyalty, affection, and space. Lacking any or some of the aforementioned factors in any relationship is one easy way of driving the relationship towards the rocks.
Here are reasons why relationship fail.

1. Loyalty

One major reason why relationships fail is lack of loyalty from ones partner. And loyalty requires a level of faithfulness in every relationship. Most relationships, at one point or the other get faced with cases of infidelity, but not all come out looking stronger. It is not possible for anyone to trust his or her unfaithful partner in a relationship. Most times when people get involved in infidelity in a relationship, it is as a result of problems like lack of loyalty that has existed for long. It is easy for your partner to find comfort in the arms of another man or woman when you fail to play your own part in mutual loyalty in your relationship.
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https://www.9jadopest.com.ng/2019/07/7-reason-why-relationships-fall-apart.html

Good one

Thanks mixy