Why don’t FWBs treat you like a friend?

I’d been FWBs with “Ari” for about six months. She only contacted me when it was convenient for her (mainly for sex), so she wasn’t much of a friend. On Monday, she tells me that we should just be friends. Then yesterday, she posts a story of her and her boyfriend.

I’ve immediately unfollowed her.
Why don’t FWBs treat you like a friend?
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