@s4noai well, she was her childhood friend where they know each other. They know each other's stink and preferences. Knowing him sleeping with multiple women and not into anything serious for many decades plus him saying that "nonsense" at chapter 48, of course anyone would be surprised to see him in what he says is serious and with a guy which she is totally shocked to know since he only swings around women and he was a homophobe from the start too so it will really come as a surprise to see someone who is a swinger and a homophobe to have a serious relationship with a guy.
Her shocked expression kinda pis*** me off though.