Best way to ruin any relationship

Tell me, what is the easiest way to ruin any relationship?

Words. Unkind, deceitful, insulting, mocking, and distasteful words can ruin any relationship. I have learned from my parents, that if you have nothing good to say, it is better not to say anything. So true. Because words though could easily dissipate once spoken, their impacts on the hearers or recipients last. Dr. John Sklare says it well:

There are few things more devastating to the human spirit than a few carefully chosen negative words from someone you care about. The truth is that those who are the closest to us and know us best also know what buttons to push to cause us the most severe kind of emotional pain. In this way, words operate like verbal daggers. They pierce your emotional armor and often leave you feeling hurt, wounded and emotionally bleeding, just as if you have suffered some kind of physical injury. This is especially true when angry words are directed at you when you’re feeling most vulnerable. They can leave unseen scars on one’s heart and psyche that cause a very deep and agonizing kind of emotional pain. ...this often happens in the heat of an argument between couples. today ...be careful about what you say when you’re upset or in a heated argument. You can never take back something you say, but you can spend the rest of your life apologizing for it!

At this point, I need you to say something. ^^,

Nice comments please. Namaste!