Boyfriend asking another girl about boobs?

So my boyfriend was talking with a girl he’s been friends with and he noticed one day while passing by that she wasn’t wearing a bra so he proceeds to text her saying he can see her nips and then asks her about her breast sizing before she got her boob job.. (he’s not into fake boobs) but I’m curious if I have reason to be mad about this or just let it go? I feel like he shouldn’t care to talk to her about her boobs if she’s just a friend but I’m not sure if I’m overreacting? Since I don’t talk with my male friends about my breasts and I don’t think they care to hear about it either. Please give feedback about this.
Boyfriend asking another girl about boobs?
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