Hmmm, I hope you won't take this the wrong way--but frankly whether he stays with this girl or breaks up with her doesn't have much to do with you.  So there's no reason for you to feel bad if he breaks up with her--it wouldn't be because of you. Even if he chose to only stay with someone his friends approved of--that's still his own choice.
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I think that's why you don't give him an ultimatum (Leave her or never see me again), but couch it more as the choices that everyone can make. You like him, you like to spend time with him, but you don't want her around you or your baby. No harm no foul if he decides it's better to stick with his GF, most people do that with romantic partners. But that is a choice that is his, as to how he wants to handle friends who don't welcome his GF.
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Also, asking about BC was mostly rhetorical. I think if honestly a man would entertain that kind of private discussion of the sex life between his girlfriend and himself with a hostile (towards the GF) third party--he doesn't have very good boundaries. Which may be why he's with someone like that, or she's feeling particularly needy. Just sayin'.











