Leo Buscaglia said this quote

Loving relationships, though necessary for life, health, and growth, are among the most complicated skills. Before we can be successful at achieving relationships, it is necessary that we broaden our understanding of how they work, what they mean and how what we do and believe can enhance or destroy them. We can accomplish this only if we are willing to put in the energy and take the time to study failed relationships as well as examine successful ones. Loving relationships cannot be taken lightly. Unless we are looking for pain, they must not be forever approached in a trial and error fashion. Too many of us have experienced the cost of these lackadaisical approaches in terms of tears, confusion and guilt.