Do you really need to share your passwords in a relationship, what for?

I don't even share my passwords with my parents nor friends, so why would anyone share it with their partners?

I find it weird whenever I read stories of people accessing their boyfriend or girlfriend's Facebook. What the hell? Not even my mother knows my password nor get into my private stuff. Why should a boyfriend, someone that's not my blood have that type of privilege of accessing my account?

Do you really need to share your passwords in a relationship, what for?
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