Hello ewie, here are two examples:
* I gave him a good idea on how to be successful in the job, but he turned it back on me and became my boss .
* I thought he was my best workmate, but when I had a hard time in my career, he turned back on me.
Where are these examples from? Did you find them in the writing of a native English speaker? If so, who is the author, and what is the book or other work from which they are taken? Or, did you write them yourself? In that case, what is the idea you want to express?