Thanks For the advice, am rebuilding my life and business again. The problem is she is not in love with him and he is not with her. What hurt the most was that he left his wife for her, slots his children in at their convenience. He is not a good father and was not a good husband either. I thought I was with a man who was abandoned by his wife for someone else.
Your son's dad maybe scared his son will get close to another man and call him dad. A good man will come and stay regardless of your ex. With the new person just be open about your feeling for your ex. Ask the new man what makes him feel insecure about the relationship you have with your ex. Just break down all the communication barriers you have with your ex and the new person. Try and build a life that includes your ex and the new person for everyone's peace of mind. Your life may always include your son, ex and his partner, your partner. The most important person in your lives is your son, his happiness is linked to the happiness of everyone concerned. You can break down communication barriers by forgetting the past and looking at fears and problems of each person concerned. Once the doubts are gone, the relationships will grow in a new and wonderful direction.
All the best for the future