Here is another take on it.
I was prescribed the book "When I say NO I feel Guilty" by Manuel J Smith when I saw a therapist. It saved my life and my sanity by helping me learn how to recognize when I was being manipulated but also by learning how to resist and how to be healthily self assertive.
It was a skill set/communication tools which I lacked due to a sick family situation in the way I was brought up. I could not think it through, I had to be taught how to do it!
I can't tell you how learning healthy ways to say NO, how to recognize being manipulated and how to set boundaries, etc changed my life for the better. The difference between life and death (I was suicidal before this) , the difference between night and day... but better. Like a huge weight had been lifted off my shoulders. If I could do it, you can too.
The book is out of print now but widely available on used book sites, also there is a PDF and a youtube version of it. I recommend the book highly, if you are a reader, you might find it useful as well.