Someone who is usually a source of bright sunshine in your life is feeling a bit depressed right now: but you need to act like you don't notice. Avoid making them feel like they're the object of pity or sadness and just try to keep them communicating with you. Eventually, they will open up about what is bothering them and you will be able to see a way to help them see the brighter sides of things. Throughout the day, keep in touch with them and remind them that someone cares about them.