is it right that my fiancee is sharing his ps4 account with his friend instead of me?

so i want some opinions On this. my fiancee has a best friend hes known since high school. anyways his friend is in a tough spot money wise and so he shares his acount with him so he has games to play. my issue is this (I DO FEEL BAD FOR HIM BTW): i buy ninety percent of hisPSN cards for games. so shouldnt i get to share the account since im paying for most of the games? instead of his friend having access to the account and games? if i want to play a game i got him i litterally have to buy another copy. i feel its unfair that i have to spend more money on a game that we already have. so don t get mad at me just want some opinions on this.