article_snippet.sent: Don't criticise their new partner .
article_snippet.sent: Nothing looks more dignified or signals you really are moving on than giving your ex's new love the thumbs up.
article_snippet.sent: If you applaud their current choice in partner, you're effectively saying their had good taste in the past (when their chose you!).
article_snippet.sent: You might not want to swap 'parting gifts', like Chris and Gwyneth Paltrow are rumoured to have, but a card expressing disappointment that it didn't work and wishing Chris and Gwyneth well for the future is a nice gesture, if you really do mean it.