Boyfriend commenting on another girls boobs?

Hi ladies. Just wanting opinions here

My boyfriend and I have been dating for 4 years, I'm 21 and he is 23. There is a 6 year difference between him and his sister. His sister has a best friend who has been in their lives for many years ( over 20 years) anyway,

The friend got a boob job the other day and is fully recovered, tonight we went to my boyfriends sisters house for dinner and the friend was there, my boyfriend then says to me " now we get to see her new boobs, I'm gonna tell her they look good " so I told him " no you're not" and then he got defensive and told me to relax so I said I'm relaxed but you're not gonna say that to her. I just personally find it disrespectful to me.

Anyway, couple hours later while we eating dinner he asks her how was recovery and if she's better now and then he said " I won't lie i was scared to hug you because they're so big"

Like, is that not disrespectful or am I just overreacting??

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