Hmmm, I don't agree.

Ex's are fair game IMO, as long as he doesn't still want to be with her. Polite to mention it to the mate, and preferably in advance - but not essential.

I always get clearance from friends before considering an ex. You never know if they plan get back together. Friends who did that to me are no longer friends.

Well I wouldn't fancy any of my mates getting with my ex. Fair enough If they asked and I said yes or it were about a year.

You can't tell what feelings are left.

When it comes to mates there should be a basic moral code.
Plus it's john terry he could have shagged tousands of other women (an I believe he has had a good go at it.
He shagged this girl behind his wife's and mate's back.
And a few more, how much more of a cock could he be without shagging her while bridge was with her. As the avatar illustrates I may be biased on this matter but it would annoy me the same, I have a mate that can get nearly any girl of our age17-19 and if he did the same thing to me I wouldn't be talking to him.