I chose "not working out" because I'd want to know BEFORE the cheating happened.
I've been cheated on and it is one of the most common and most insidious breaches of trust.
A decent person decides they want a new partner, leaves their current one, then tries out with a new one.
A shitty person feels that they MIGHT want a new partner, so they try a fling, and if they decide after they tried some that they want to buy some, they cause the breakup.
I wasmarried to one of the shitty ones.