Why do people call you a slut when you don’t even sleep around?

Like honestly it’s kind of funny when girls will spread rumours or guys will imply you’re a slut or tart when in reality you don’t even sleep around at all and only tend to have Sex with a partner in a relationship.

Why say such things then? Is it just to damage your self esteem and reputation? Being vindictive?
Why do people call you a slut when you don’t even sleep around?
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