That sort of schit can bite you in the ass. Fsck him and his life. Who cares? Walking away from the situation is the only way to heal properly. Dude just needs to tend to his own wounds. If we go around trying to play the revenge card on every person that does us wrong in life, we will have very hateful lives. That's not a win.
Fsck 'em! Let them live in their immoral pitiful mess. They're pathetic and will more than likely die pathetic.
That's revenge enough.
If OP sees the csnt at spur with his family or something. Well, that's a different story
Eat half your meal, take the leftovers, drop it in front of him and say, "Well I thought after you enjoyed fscking my wife you may want to eat my fscking dinner too.". And leave.