Why do men always see me as a friends with benefits/fuck buddy?

I theorize that men categorize women within five minutes of interacting with them. Everyone tells me that I seem classy and intelligent. I dress modestly, I don’t sleep around, I’m reserved, I’m educated and hardworking. However, men still try to place me in the friends with benefits/fuck buddy category.

Before anyone says, “it’s the men you’re choosing” or “some men don’t want relationships with anyone”, I had one guy who had been courting and dating one woman for almost a year (dates, trips, +1s to weddings and galas) while still trying to convince me to be his fuck buddy.
Why do men always see me as a friends with benefits/fuck buddy?
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