Can we all remind ourselves that their marriage was more or less a business arrangement for Alphonse?
Though I agree that this random conclusion of, "Oh, he must have suffered so much from all those crazy thots after his golden dick, let me try and not make him worry..." is out of left field.
I think there should have been a least one or two more incidences involving a jealous lady, or some former lover of Al's (and I mean an actual former lover), to push her to think the way she's feeling right now.
I do hope this hiccup gets resolved quickly, though... I high-key don't want this to mess with my tea exhibitionism lol.