Of course, if you get dumpt or get traded for a nother person you are angry. Ideally you shout from the rooftops that he/she always was a jerk/bitch, but this is ultimately only negative for yourself and waste of energy. Energy you'd better use for processing your heartbreak and perhaps for finding a new love.
Of course you can talk about your ex, but some things you better don't say.
Here is an overview of what you better not say about your ex.
