Why did a guy friend accuse me of sending nudes to men?

I considered this guy a friend and used to help him out with various things. We were never in any relationship. We had a fallout of sorts, and he baselessly accused me of being in the habit of sending nudes to men. I never sent any nudes to anyone ever in my life. Later that day he tried to force himself on me. I threatened to call police, left and cut contact. Why would he make accusations out of the blue? He was never rude or aggressive before.

Why did a guy friend accuse me of sending nudes to men?
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