The point I was trying to get across was the same one I try to get across to everybody who has been betrayed by infidelity: "YOUR SPOUSE IS NOT WHO YOU THOUGHT SHE/HE WAS in this state!" Any time I see someone post "Oh, she would never ..." or "It wouldn't be his style to ...." or "Oh, you don't know my wife, she's not like that ...." it leaps off the page at me.
I don't personally like the whole "aliens" term, because for one I think it dehumanizes them and two it absolves them of too much responsibility for their choices, but it's closer to the truth than "he/she would never do that" most of the time.
