I wanted to point out that this happens very often; Game of Thrones nor House of Cards aren't completely fiction and people change rapidly when a potential wealth gain is at stake. The dominance game is very real and people probe for your weaknesses all the time, trying to exploit them and hack you for their benefit. Cover your back at all times and never put all your eggs in one basket. Push to become independent as much as you can and your talents allow.
I believe what we've both said accurately reflects our own experiences. I'm sorry you've experienced this. I encourage all, should they ever feel this way, to seek greener pasture as my own experience leads me to believe that this can be completely avoided.