3. Calm down
Being polite is always a positive thing that will help you in your further contact with your ex. Cool down before you start your conversation. Do not forget to be brief in your talking. Control the situation ans do not let your discussion turn into a never ending argument. Watch how you feel and make sure that all your negative emotions and thoughts (if any) are invisible to him.
4. Meet in a public place
Public places is a far better option than your own place when there is something to discuss with your ex. The explanation is very simple. We behave in a different manner when there are people surrounding us. We do not want to look stupid in other people’s eyes and become more civilized.