I’m married with two kids.  And my hobby life has always helped to compartmentalize my extracurricular activities.  
 
But despite my best efforts I find myself being very attracted to a coworker and (I believe) her to me.  
 
She’s younger than me, (by a little more than ten years) and we’ve been spending more and more time together.  Nothing untoward has happened yet, but she has made some discreet and some not so discreet advances towards me.  She is very aware of my “married with kids” status.  I’ve made no secret of that.
 
Attraction aside, I genuinely enjoy her company and what’s worse, I am very turned on by her.  The fact that she’s sought after by some of my single male colleagues, doesn’t make resisting the temptation any easier.
 
I'm well aware of all the arguments against an affair.  I’m painfully aware of all I have to lose.  But what I’m interested in is hearing from other’s who’ve actually gone down the path I’m contemplating.  
 
I’m curious to hear what led to the situation, how it played out, how it resolved (if it ever did) and when and if it ended, did it end amicably or disastrously.
 
I think this could be an interesting discussion.

The girl was one of my best friends Exes.  Actually, she had been his date to my wedding.  When I eventually broke it off, it was more because I was afraid of the friend finding out than my wife.  Even though he was with someone else, I felt like he'd be really hurt by the betrayal.

Anyway, I was already a hobbyist when it started, so I was used to extramarital fun.  It started out flirting at a party (where my wife wasn't in attendance), drinking, and sharing a cab with turned into kissing.  Moved on to casual affair.  I'd visit her apartment.  We spoke a little about where my relationship with my wife was, and were pretty much just friends who fucked.

I became increasingly worried about getting found out so I broke it off.  She was always cooler about it than me.  No fatal attraction kinda shit.  Actually, I really regret that I did break it off.  If I was cooler with it, we could have gone on for years.  She has since moved away, and we are still friends.