How do military police prepare for the pressure of standing their ground against potentially intimidating high-ranking officers?

I’m in love with a married man. He’s been separated from his wife for 10 years but still he’s legally married to her. He supports her financially because she was a SAHM and he’s too nice. If I give him an ultimatum; am I cold hearted?
How can a rookie cop recover from a mistake made during their first high-pressure case, like mishandling a crime scene?
What are the advantages and disadvantages of not discussing financial details like house ownership during arranged marriage meetings?