There is an good book on this called No More Mr Nice Guy. It talks about how certain psychological traits cause people (usually men) to start make invisible con

There is an good book on this called No More Mr Nice Guy. It talks about how certain psychological traits cause people (usually men) to start make invisible contracts with other people. This is usually because of a lack of assertiveness and a certain “fear” of being made fun of for asking for something The remedy is to go through assertiveness training, which the book covers. Another great book called When I say No I feel Guilty goes more in depth on this too