He is a highly sensitive individual, meaning that he is overly concerned with his own feelings and the feelings of others, and that he's easily hurt by what others say or do. This sensitivity can make him vulnerable to being taken advantage of by those he trusts, as he might not notice if something is wrong, or he might not be able to protect themselves from those who would do him harm. He may also be overly dependent on those around him, as he tends to be very trusting.