i really need to talk to someone or get this out

I wish more people could realize that no one can give nor take away the gifts one possessed all along. Only we can weaken or strengthen ourselves.

At least, you had the awareness to reach out to others for positive advice, I commend you on that.

Over the years, I have heard from others, that when they first started on the path to spirituality they were often confronted by negative situations in life. Situations that seemed intent on getting spirituality off their mind.
Persistence in walking the path of spirituality conquered in the long run, with great rewards.

To me, it is obvious the mentor you mentioned had his own weaknesses. He plied upon your weaknesses to gain his strength over you. You allowed this.
It sounds like you will no longer allow this. You will come out of this a far stronger person than he can ever be.

You are as the single blade of grass that splits the concrete.