Why do some women provide "wifey services" at the price of a girlfriend?

many women provide their boyfriends with wifey benefits such as : washing his underwear, cooking his lunch box, cooking breakfast lunch and dinner for him, raising his children, . while deep in her hearts, she knows that he would never ever make her his wife.

why do women settle for this? many of them even wear fake rings on their ring finger pretending as if they are married. while their boyfriend has never even proposed or ever thought about proposing.

Why do some women provide "wifey services" at the price of a girlfriend?
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