I didn't read it thoroughly....but both of them aren't misdiagnosed. Both are pure beta and it's hard to be there too when ur a beta couple but both guys...it's really harsh to everyone this omegaverse... they're love for each other is like no other tho. I'm confident to say that they were just going through the toughest phase of marriage but they're actually just a wholesome couple since high school
Kimi to Unmei ni Tsuite no Hanashi ga Shitai