Again I do not understand

I do not understand people who keep searching for what they already have found. People claim to be looking for love, someone to accept them, someone who can make them happy. When they find that
person, they use and abuse them until what was and could have been beautiful is ugly. They totally destroy all good. Then they once again begin to search. They continue to search totally oblivious to the fact that they had found what they are searching for and had destroyed it.