Loyalty Tester

Castiel James Novak runs a detective agency with the main emphasis of cheating spouses. He and his partner Charlie Bradbury take care of cases to support helpless wives and husbands. Their conception is hard to get used to but effective.
It is just effective cause Charlie and Castiel don't break the concept, and then it happened anyway. Castiel broke one rule for the sake of a new customer and now he had a big problem:
He started to like the husband romantically. The man he has to discover as a cheater.
Feelings of doubt were rising in Castiel's heart, was Dean Winchester really cheating to his pregnant wife or was it all just to cover the wife's cheat on her husband?
Was it really Dean's unborn child?
Was he so much in love that he couldn't see the Winchester as a cheater?

What was real anymore?