If your partner committed a crime and got a jail sentence, would it be akin to them cheating on you in the sense of it being that big of a betrayal?

Hmmm..... it might depend on the stupid thing he did. A friend of mine got arrested for beating the snot out of his sisters boyfriend when he slapped her infront of him.
Something like that i could forgive FAR faster than a DUI or a bar fight.

Context matters. Not everything illegal is immoral.

there are so many “crimes” that i would actually be pissed if my spouse had the opportunity to do and chose not to “for our family”.

Many MANY times my hubby has held himself back from punching someone or getting into a fight w someone coz me and/or the kids were there. His single self would’ve done it, no doubt. But he has alot of self control when me and the kids are around. He would never land himself in jail for something that could’ve been totally avoided by emotions/choice. Yes he swears at them, he has bad road rage. But I’ve never seen him step out anymore like he used to pre-kids. He once ran someone over but that’s because the dude was on foot running full steam at our car 🤣 he just didn’t stop. I don’t blame him for that one 😂😂 (dudes okay btw lol)