I recommend you pray and ask God to have this situation bring you closer to God. There are many things in life that on the surface may appear to be "bad" but are actually a life lesson being brought before you where you can choose to grow from it, or not. Everyone is different, but perhaps there are messages in this for you in regards to trusting people, and knowing that no human in existence should be followed as the sole advisor. My greatest spiritual advisors always ultimately taught me to go within for answers through meditation, ultimately following the path of the great spiritual teachers who contacted the divine directly. Every single one of us can make direct contact with our spiritual teachers, we do not need human intervention.
I would recommend showing compassion to this person, dismiss any negative feelings and realize he or she has the same weaknesses we all do and he or she is having to learn some tough lessons on a soul level right now as well.
Also pray that you be led to a new person that can help you on your spiritual path, again knowing that they are just someone to help you but not to dictate everything to you.