Meet partner at a very private place, somewhere where you feel safe and relaxed to break the news.
Be calm when you tell the person that things don’t seem to be working out.
Expect strong reactions or an emotional breakdown of the other person.
Bring out the positives in the other and wish the best in life.
Never ever argue or point out faults that have led to this break up decision.
Don’t bad mouth or spread stories after a break up.
No parting gifts. Just good wishes in plenty. And never stoke the old flames again.