Absolutely not. Sorry for interfering but if the man was really interested in establishing a relationship with his son and making up for not being there, you would not be a factor. I don’t mean that in a negative way, but you would come after any chance with his son. Also has he even thought whether his son wants to know or not? In addition to this if you are happy and in love this shouldn’t even be a choice for you, this is not best for son. The man has failed to be there for him his entire life, then shows back up and tries to use him as a prop in emotionally blackmailing you. He sounds like a selfish man, who has realised he has nothing and is now trying to force a family scenario from you to give himself a purpose. And what if you did take him back and he left again, what damage would that do to your boy. he is best left alone. You have done well on your own, giving your son a stable upbringing and have found yourself happiness, let him rot in his own misery. Tell him either he focuses just on his son, and makes a good job of it or he just stays gone for good. neither of you need him. You will soon see if and how much he felt for his boy and whether he fully intended to be a dad.