LOL yeah that's what did it for me, "Pinhead"
too funny!

But back to the regularly scheduled program,
her cooking food for and talking about this other guy at work is a huge red flag on the play.

Think about this,
she cares enough about this guy to cook extra food for him and feed him, that's a very caring gesture. The fact that she talks about him freely in front of you doesn't suggest the same caring gesture towards you.

Since you mention the "macho" stereotype,
what is the "macho" stereotype, I'm interested in hearing your definition of this.

Men are attracted to Women.
Women are attracted to Men.
Women are not attracted to Men who act like Women.

What kind of man are you?
Over the years have your attractive masculine qualities washed away to leave behind a tired older man who is just a parent and not really an attractive mate for your wife?

Only you can answer that for sure.