While I strongly advocate a betrayed spouse set an INTERNAL deadline (how long they are willing to "stand" for their marriage, before they made the difficult decision of having to file for divorce), I never EVER recommend that you actually COMMUNICATE that deadline to a cheating spouse!
Of course. Something my W and I agree on is never threaten unless you are going to follow through. If I pull the trigger, I'd be looking for a Y/N answer to "are you ready to quit A and commit to fixing M from this day forward". If I didn't get a yes, I be looking to file the next day.
Nope, no lack of balls there. Once I launch that ship, she'd have to be damned convincing to stop it.