I know what you mean about the awkwardness regarding the elephant in the room in conversation. I HATE that! It sounds like you handled it well though.
I'm sorry to hear about your friend. Cancer is an ugly beast. I can also sympathize regarding your feelings towards their marriage. I often feel that way myself. My sister and her husband fight about stupid stuff all the time. Recently they had a fight that was a lot of yelling and they even broke some stuff in the house that needed to be repaired. Then the next day they were all lovey with each other and apologizing to each other. I was gad they were able to make up with each other, but on the other hand I can't help but think how I would have never treated my W that way...how is it they can make up after physically breaking things and yelling obscenities at each other, yet I am unable to work through whatever it is that has plagued my marriage? I have always worked hard to be a good H...but I have to remind myself that it doesn't actually have anything to do with me.
I'd love to meet up for a drink or several. Not sure about my availability, but hit me up if you have time. I'll actually be in Houston Feb 2-3 if you are anywhere close.