Britannia All at Sea, chapter 4

I have a dim memory of disliking other Bettses in the past. Dim, I tell you, because everything is pale compared to my contempt for this particularly stupid Betts heroine. First off, Jake is arrogant (p. 65), and she thinks: "Such arrogance...but she could alter that." Seriously, doesn't she read anything in the paper from Agony Aunts? People don't change because you love them.
Then, after Jake takes Britannia on a tour of the hospital, he rushes her away without her coffee. So he brings her home. He pulls into the gates, and drives down the long driveway to his home - I'm picturing something like Manderley here. It's a long enough driveway that Britannia can't see the house at first, and thinks he has taken her to a park without the owner's permission.
She's an idiot, seriously.
When she finally realizes she is at the house she admired a few days before, she says, "well, you might have told me" (p. 69). With great forbearance, he doesn't point out that this was a mystery most children could have solved, handily, and merely replies that he didn't see any readon to tell her.
She meets his mother, and the lovely Madeleine (the woman Jake had been in church with the other day). Britannia feels - and is - underdressed, because she had been starting a bike ride when Jake hauled her off to the hospital. So the timing could have been better for Jake to kiss her, and to say he's halfway in love with her, and to say she'd be a fine wife for him (I'm paraphrasing here).
But Britannia is so stupid that she latches on to his admission that he's forty, and if he hadn't met Britannia he might have married Madeleine, just to keep the family going. She ignores the part where he says that now that he has met Britannia, he'll never marry Madeleine. She even ignores Jake's surprising admission that "I find that without you my life and my heart are empty" (p. 74). She ignores all calls to her good sense, and decides that she's not of the same class as he is, and they can never marry.
This is tiresome because it's demonstably untrue - both of them are upper-middle-class (Britannia less so, but still), and also because there are still five more chapters to go. I just don't know if I can take it.