Weeping in dreams is not at all unusual. This is often because of the emotional power carried by the images and persons you are encountering. Weeping in the dream is generally separate from actual physical tears forming. It is more often that weepy feeling you get in your heart when a particularly moving scene is played out before you. The best advice is always to go with the dream. Emotional releases and revelations can have a very cleaning effect on the psyche and should be embraced whenever possible. However, you should try to determine the trigger event that caused the emotion.
Did someone else make you cry directly?
Were you crying for a particular reason, or was it for a general emotional release?
Did the tears make you feel ultimately better or worse?