It's a bit weird when you run into a friend's ex-girlfriend. I like to think that I'd say hi when I see them, but the truth is that I'll only do it when I know for certain that they've seen me. Even then, I say hi very softly just in case I actually slipped passed their vision. Let's face it, though. I'm not very hard to miss.
So, we end up exchanging as few words as possible, at least on my side. I try to not let things go passed "hi", unless I really got along with the girl. But when it's your friend's brother's ex (did you follow that?), I won't even say anything.
And oh boy is it fun when they're out with another guy! In the back of my head, all I'm thinking is "haha! You're the idiot who came after my friend." 9 times out of 10, the girl is completely crazy and good on your friend for getting out of that circus they called a relationship. Then there's the 1 time that you know your friend is still at home and crying his eyes out after reruns of Scrubs. Great show, by the way.
Seeing as I've had the fewest exes of all my friends, I wonder what my friends will think of my future ex-girlfriend. Hopefully, they'll treat her with the respect that she probably deserves and the dignity every human should receive. This is all just in the moment, of course. We'll drag her name through the mud later, the bitch.