Help! What to do about a friend who cheated.

This past weekend, my wife and I found out that a very close friend of ours cheated on his wife. They have a young daughter together. The 'other woman' was coming up to his work and flirting and all that, and eventually he chased that dangling carrot. It all came to a head when the woman called my friend at 4am to warn him that her husband was coming to kill him, and his wife answered the phone. Nothing happened, though, thank God.

I don't know if I can even look my friend in the eyes again. I have lost ALL respect for him, and I had quite a bit. I just don't know what he was thinking. We had been talking all year about doing some deer hunting this season, but now I don't even want to hang out with him.

His wife said that if it weren't for their daughter, he would be gone. That makes me sick to think his own daughter is all that is keeping the marriage together. I wonder if he knew he had that leverage going into the affair. His wife's mother said she can't even stand to look at him any more. I feel the same way.

We're still friends with his wife and wish them the best, but the whole situation is crazy.