Why does he not like if someone compliments me?

JJm1234
A couple of weeks ago me and the guy I’m seeing was having a few drinks in the place that I work. My manager was telling him that I’m a really nice girl and lovely. After he walked away my boyfriend was saying things like ‘I know you’re lovely’ and ‘I don’t need him to tell me’. He went on about it a few times. He even mentioned it to my mum and said he doesn’t need someone to tell him how nice of a person I am and that he knows that himself. I found it odd that it seemed to piss him off someone else telling him that I’m a nice person. It’s like it made him annoyed
Why does he not like if someone compliments me?
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