I hate this type of woman. Really?! Hide to him that he has a son just because he didn't love you? Are you kidding me? Protecting her son?? Lol. In real life when he'll new the truth, your son can even hate you. You are taking his life and his future not because you want to protect him (because his father can do it better than you) but just because you are searching an excuse for your egoism. I dont care if others want to find excuses for her behaviour, sorry she dont have one...
Myself