To dream that you or someone is moving in or out of a place signifies your desire or need for change. It may also mean an end to a situation or relationship; you are moving on. Alternatively, it indicates your determination and issues regarding dependence/independence.
To dream that you are helping someone move indicates that you are afraid of change. You are not quite ready to confront some new situation by yourself. Alternatively, to help someone move implies acceptance of some new change, even though you may not agree with it.
To dream that your ex is moving in with you indicates that you are still holding onto some aspect of the relationship. You have not fully let go.