ex's!!!!!!!

[Chandra Amaya]

I am so mad that I cannot see straight. My ex has not seen his kids in over three years. My youngest son (who is turning 9 on april 29th) told me that his father told him that he cannot trust me because i never told him that he is adopted. My son was not adopted. He almost died when he was born! He was an emergency c-section because the cord was around his neck and his heart rate dropped. This child cried his eyes out. Why would his father say such a thing to him? I know he is a drug addict and mad because i left him and found someone I am happy with now, but I just can't understand this. My oldest daughter confirmed that her dad did tell Sebastian this.
He tried to get me to give Sebastian up for adoption or have an abortion. When they took us to do the ememrgency c-section my ex who I was still married to at the time decided he was hungry and went to eat while I went to surgery.
He contacted me a couple of weeks ago wanting to see "his kids". I did not want him to because he breaks their hearts by promising to come back and not showing up. I thought about allowing him supervised visitation at DCS, but after hearing that he told my son this, i do not ever want him around them. Am i overeacting? wrong to not want him around at all? Anyone have any insight on why he would say this to my son? Please help, before i scream!