To answer your question about my W's OM, I know he is 11 years younger, divorced, a former employee of my W and either a giant dirt bag or a turd wrapped in a layer of the same.
I question how he could be interested in my W (two kids, divorced and 11 years older). Being his former boss, I am guessing he worships the ground she walks on, and she is loving every minute of it. He probably makes her feel younger or something...who knows. Their R is something I will never be able to get my hands around, so I am no longer trying.
I guess at the end of the day, no one likes to be alone and if you love someone, you love them, end of story.