I don't know. I think if it's true that Fishy leans conservative and he comes from a close-knit family, it might take a lot for him to leave her. Especially with GG in the equation. There are a number of loonies at my workplace who have managed to keep their husbands for decades, so I think some men just find someone and go with the flow. It's not like he's particularly dashing so he might not have a lot of options out there anyway. As long as Elle continues to cuck her good puhsta and not bankrupt him (we have Mamie for that), it might just last.