The unfortunate truth is that most relationships have a tendency to fail no matter how hard each partner works to make it a success. And the sad truth is that there. The #1 reason why relationships fail is because they are built upon a form of . communication and openness to even the most tired, worn-out relationships. If you don't have this skill, your relationships will fail. Sign up for my Motivational Mailing List and Newsletter. Actually, this approach to love is why relationships fail. Most see the main problem of love as that of “being loved”, that is finding the “right”. Why do some relationships fail while other relationships stay strong? Why do some people seem so happy in their relationship while other people are miserable. If you don't have this skill, your relationships will fail. Sign up for my Motivational Mailing List and Newsletter.