Charlie~
Absolutely not
Charlie would be loyal and make you happy and she wouldn't even consider cheating on you your the only person for her.
Vaggie~
No chance in hell
Vaggie would ask why you even asked her that question "of corse not hun I would never do that" she reassured you there's nothing to worry about
Alastor~
Straight up no
The reason being is because he's asexual so he would be able and also he would want to he's the only one for you.
Angel~
Yes
Only became he has to because it's his job to give his "services" to people in Hell but he would never cuddle his clients because he only cuddled you.
Cherri~
No sir
Cherri would never because she would miss all the turf wars you two get into and it just "wouldn't feel the same"
Sir Pentious~
Nope
Sir Pentious would never cheat on you he's loyal as fuck. He would shout at the egg Bois because he thought they had something to do with it. But no he would never cheat on you. He would want you and him to take over Hell together.
Husk~
Never in a million years
Husk would never cheat he would miss getting drunk and playing card games with you. You two have an extremely close bond.