So many times, we look to others to supply our happiness. We derive our worth and emotions from how others treat us, and how valued we feel. It doesn't have to be like that though. God, in His infinite wisdom, is outside of time, so He can spend eternity loving us. He doesn't change, like people do, and He is always going to be there, even when our friends can't.
Joy comes from within; it's God's gift. Every day, we should be awestruck that He cares so much. It's fantastic to think about!
Joy is not based on something that is going to change. If it's true joy, then it comes from He who never fades away. :)