Boyfriend does not know what are my good points?

Cerate
When I ask my boyfriend what he likes about me, he says this...

bf: "u ask me what i like about u, i also dunno"

I've been tgt with him for 7mths, why doesn't he know what are my good points? Can someone try to decipher what is he thinking and why is he saying this?
Boyfriend does not know what are my good points?
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