....next door neighbor is a buddy, he's also more of a drunk asshole than me....but...he has a hot (to my eye anyway), live-in GF who is sometimes tired of his BS. She has made "overtures" that something could "happen".....Few things I need to think about"
1. I would love to fuck her.
2. I'm married.
3. He's a buddy
4. We live next door
What would you do?

Ah, the good old shitting where you eat. Don't go there. But to be sure, post a pic so we can establish said hotness.

Spot on Bikeage.
Situation best left alone, sounds like a clusterfuck of badness waiting to happen.
A pic would indeed assist with a more in-depth evaluation of risk vs reward.

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Enjoy the view & let the overtures play out. A drunken a-hole is not worth the hassle. JO to her, let the fantasies flow when you're with the wife. As Essex wrote, a pic would be nice to see, but be cool about it when attempting to snap one. But post a pic, "share" her so we all can get off to her!

In a similar situation. Next door neighbour is married to a latino hottie. She's about 4'10"... cute as fuck. I Know she only married him because he was "safe" and she was getting into he 30s and wanted to settle... but damn...

as good as this sounds and as bad as you want it, Just jack off to thoughts of it all. I say don't do this - bad idea. This could go bad in so many ways that it isn't worth the bit of fun you would have.