At first I was worried for his wife-when he was telling her to get in the car as they were preparing to leave the police station, I was like, "I wouldn't go with him if I were you." Had he not been caught, I shudder to think of what he could've done to her, too, with time.
But yeah, when they started talking about him going to the other woman's house, and they kept going back and forth between his driving there and her tending to her sick daughter, I could actually feel my stomach sinking and my heart racing and all I could think was, "Oh, god, please, please tell me this isn't going where I think it's going...". To take them both down like that...I just... There's no words.
I honestly don't know what the hell his thought process was. As the episode noted, he could've just, y'know, come clean to his wife, taken responsibility for the child he fathered with the other woman, and sorted things out from there. Not an ideal scenario, no, but it's what any sane, rational person would rightly do.
But nah, better to take the batshit insane route instead, and destroy a whole bunch of lives in the process because he was too stupid and self-absorbed to stop cheating/use protection/etc., I guess. Fucking psycho.