Want to be happier? The   less you attach your happiness to people or material things, the happier you'll be. Why? Because material things come and go, as do people. They're transitory.  What brings us true joy are experiences, which can create lasting memories. While things may have ended badly with your ex-boyfriend, there's no harm in conceding that you cherished -- perhaps to this day -- the times you spent with him, even if you don't want him back in your life. Or, you may reminisce about the trip you and your friends took to Cancun while you were in college, even though time and distance have caused something of a rift in your friendship. See what I mean? Focus on the experience and how it enriched your life, not on the person. Relationships evolve just like the people in them. Depending on someone else to be happy sets one up for disappointment in the event that person does a one-eighty, which most of us have experienced at some poin...