Why is my boyfriend so upset about the fact that I don’t wear underwear most of the time?

I’ve asked him why is it a problem with him, and he never gives an answer. I’m not a girly girl so I don’t really like to wear dresses and skirts, I always wear pants. But he makes it a big deal every time but never tells me why. But he can sag his pants and show all his business to the world.

Why is my boyfriend so upset about the fact that I don’t wear underwear most of the time?
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