How to tell you son ?

Chrissy • I love my family and proud mother of four beautiful boys and taken by my soulmate !
Ok before my son was born me and my ex were expecting but I found out that he had someone else pregnant to I got mad and moved out had my son and now my son is now three and I moved on have a wonderful man in our life's my question now is should I ever tell my son about him when he's older and should I ever tell my ex about him