Speaking of guardian angels, it is a fallacy to believe that every individual has an assigned guardian angel. There is no biblical support for this concept.Not wanting to be critical or picky, but this is somewhat out of harmony with what your guardian angel thinks.
At the same time, since angels are ministering spirits, they are sent to minister to, and assist Christians (or the OT saints), as and when need. At least in the Bible record.
The New Age Movement caused a shift in the focus from God and Christ to angels. However, since the NAM is riddled with false doctrines, chances are that the angels connected with them are in fact evil angels pretending to be good.