Would you let this slide if your boyfriend did this?

I was telling my mom that she was the prettiest woman in the country (despite her only saying bad things about me) and she looked up at my boyfriend and he gave her a suggestive look that implied “yeah you are”. It was like a diss to my face but he told me that he only did it to flatter her? Deep down im panicking a bit lol what do you guys think?

Would you let this slide if your boyfriend did this?
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