my son

my son's sperm donor don't want anything to do with my son I let my ex boyfriend sign the birth certificate and he signed the affidavit because my sperm donor said he was going to kill my son and I if he was the father so I had to do what was right for my son I was with my ex a week before we broke up and I was looking for a rebound then I found out I was pregnant did I do the right thing by telling my ex he was the father