How is that not kosher ?

Not kosher would have been seeing him while his wife was alive, right ?

Is he supposed to remain alone for the rest of his life ?

They have things in common.

I think you're over-thinking this.

M 20+ T25+
S ~15.5 (BD)
BD 4/6/15
D 12/23/16

"Someone I loved once gave me
A box full of darkness.
It took me years to understand,
That this too, was a gift."
~ Mary Oliver