What does this Reddit questionn mean?

I've been browsing through Reddit again, my favorite stress relief which is kind of sad ๐Ÿ˜‚

Anyways, this woman explains how she wants to do cosplay as he boyfriend likes watching it. However he says he doesn't want her doing it. She says she got every upset and thinks it because she is ugly.

Is it a fantasy thing for him and he doesn't want it to be real? Does he not find her attractive? What does it mean?
What does this Reddit questionn mean?
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