I would not be so sure about Katherine Howard cheating (or being in love with Culpepper)… chances who she was simply blackmailed for her past (and had not actually betrayed Henry) are pretty highI think that it is safe to say that all of OTL wives of Henry VIII deserves a long, stress-free lives!
One thing I find interesting when it comes to OTL wives of Henry VIII, the causes of death rhymes.
1st Katherine of Aragon: Cancer
2nd Anne Boleyn: Execution(wrongly, of course)
3rd Jane Seymour: Childbirth
4th Anne of Cleves: Cancer
5th Katherine Howard: Execution(she did cheat on Henry VIII, unlike her first cousin)
6th Katherine Parr: Childbirth
Like I said, I find this interesting, even though last three didn't die in the order of death of first three.