there's a difference between being happy and feeling content. content means things are good enough, while happy is laughing and smiling and feeling wonderful. i'm a simple person so I'm mostly content, but I haven't been happy in a long time.
I seem to have everything, and money, and a family, and a favorite business, and I could be happy, but I do not have mutual love, and that makes me unhappy. The person I like very much does not have reciprocal feelings for me, and so I feel very unhappy because of this.