Why couldn’t my narcissistic ex compliment me but he did other girlfriends?

He would compliment me in ways like saying I’m so hot. I’m banging and “big fat ass”. He’d never really compliment me in any other way and not often at all. He’d say i was pretty occasionally too

But with his other girlfriend would say she had perfect boobs. And bigged them up so much. I have no idea how often or if he said other compliments but he was able to say that off his own back. But with me he couldn’t.

I’ve read that narcissists will compliment people less the more attractive they are. His friends told me this girl wasn’t anywhere near as good looking as I am and my narcissistic ex himself said it too. Is that why?

He always said bitterly I know I’m good looking. I know I have a big bum. I know I’m good etc.

What is the reason he couldn’t compliment me but he could this girl?
To bring me down
He liked her body etc more
Something else
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Why couldn’t my narcissistic ex compliment me but he did other girlfriends?
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