Man, my wife had a brain stem stroke. She was completely debilitated for a couple months and partially debilitated for many months after that. It's been years now and she's still not the same.
The last thing on my mind was cheating. The FIRST thing on my mind was making sure my wife's needs were met every single day.
She had to learn to speak, walk, drive, write, etc. ALL over again. Not once did cheating ever even cross my mind.
Fuck your friends wife. She's a cheating cunt.