There was a great amount of love and concern that this universe would survive and that the intelligence placed in this universe would be that that would be of an unlimited nature. As creative intelligence began to take form in your universe, Love of a parental nature was there to help guide, nurture and protect the fledging new creations that were becoming self-aware. This divinely created intelligence has taken many forms in your universe. Some of these forms you think of as extra-terrestrial beings that you do not understand. However other forms you have experienced outside your understanding of self you call angels.
Angels are a single consciousness with individual expression.
The individual expression has freedom within the totality of the Angelic Kingdom. They are free to come and go at will. The angelic vibration is like a moving river or a current. Sometimes an individual expression stays for hundreds of thousands of years in your universe, or some for only a brief time. It is their choice.