"The EX" etiquette

When you see an ex with his new girlfriend... Always smile sincerely.
Be polite. Show no malice or ill intent behind your eyes.
Be graceful. Not envious. Engage in enough conversation so as not to be rude.
Don't delve for any new information - who cares really?

Know that you are a better person for not behaving badly or bitterly towards your ex.
Even if you do want to spit in his eye.

Always say hello and goodbye.

Make strong eye contact.

Show him you just don't care anymore.. And that anything that was once there... Is now gone. Yup, allllll gone buddy.

...I just about remember your name my friend!

And as you walk away... Throw a smile that simply says
'Lovely to see you both and You're welcome to my sloppy seconds.... Enjoy'.