My boyfriend compliments other women, but not me? Why?

He'll say other women are " hard working", "smart", "nice", " funny" or whatever... but he never gives me any compliments like that. Sometimes it feels like he actively avoids doing so. Like today I showed him a portrait that I drew and he said " I don't like those portraits, every artist draws women who are pretty. I've never seen an artist draw an ugly woman. its harmful to society to just draw beautiful women".

I know he wasn't saying it as a personal attack, but I felt so discouraged after that. Why can't he ever just say something nice about me? No matter what I do I feel criticized.
My boyfriend compliments other women, but not me? Why?
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