During my sitch, I was given two or three REALLY excellent pieces of advice (OK, I was given HUNDREDS, but there were just a few that became basic, daily mottos for me to live by).
One of them was, in my response to my question of "How will I know when my wayward wife is telling the truth?", after she'd lied to me, to our adult daughters, and even to her own parents, repeatedly.
I was told:
"When her actions align with her words, over time . . . then you will know she is telling the truth."
I later learned that the time frame to that "over time" was measured in months, not in weeks (or even days!), but looking back now I can see how ACCURATE this was.
The #1 advice I got, by the way, was "In every situation, don't worry about what your wife will think or how she will react, or anyone else for that matter. Instead, simply DO THE RIGHT THING. Ask yourself 'What is The Right Thing to Do in this situation? What is the thing that God Himself would tell me to do, if He were standing right in front of me right now?' "