Help! My Ex and I Are Like Siblings. His New Girlfriend Ruined Everything.

Dear Prudence is Slate’s advice column. —Doomed Platonic Friend Dear Doomed Platonic Friend, His relationship with this woman sounds very new, and I don’t think you know yet how everything will shake out. —Entirely Too Much Ado Dear Entirely Too Much Ado, If this question were about a performance of a serious play that you paid a lot of money to see, you would be perfectly within your rights to turn around, assume a kindly Brontosaurus posture, and whisper, “We’re having trouble hearing the dialogue, would it be possible to make less noise? Dear Prudence, I have four best friends I’ve known since childhood where I know the feeling is mutual, have already been their bridesmaids, etc. I also have a friend I’ve made in adulthood who I know has “best friends” who aren’t me.