It could mean that you're trusting a lot of people, but they have been turning on you. Do you know how you react to them during the dream?

EDIT:
Heres is a possible dream key meaning:
Island:
You may have a craving for solitude if you dream a desert island. Perhaps you are surrounded by too many problems and need to make a little space for yourself? The sea often symbolises the unconscious mind so your desire to remain on an island may suggest a wish to cling to the conscious ego instead of venturing into these unexplored parts of yourself.
The sea is also a mother symbol and can, according to Freudian psychology, symbolise your relations with your mother. If the island is engulfed by the sea this can represent the fear of being overwhelmed by too strong a mother-attachment or by unconscious forces that are out of your control.