I agree that happiness is a choice. But as humans we can not help feeling joy as a result of certain experiences... like hearing your favorite song, winning money, the first time seeing a close friend after several years, etc. The experience of relationships has a major influence on human happiness, but I don't think its necessarily needed to feel happiness. I have found that many people unconsciously allow circumstances and conditions to determine their happiness. They just don't know any better, they never learned. Understanding that happiness is a choice is very empowering, and as a result it would appreciate relationships tremendously.