Look Hon - I get that you are desperate for your LO's father to be in his life .... but you cannot MAKE that happen
This man quite obviously just sees you as a sexual plaything and isn't the slightest bit interested in getting involved in an emotional relationship with you - if he
was then he has had ample opportunity to do so
It's one thing for a child to be told that his Daddy (who he has never met) had another family who he had to be with (or whatever you choose to tell him) and quite another for him to be exposed to a "Daddy" who comes to the house, ignores him completely, has sex with Mummy and then fucks off again
That's REALLY going to kill his self esteem
It doesn't matter how much we WANT someone to do something or for things to change - we quite simply do not have the power to change how other people behave ... all we can control is our own behaviour
and right now you are heading down the path of seriously hurting your son
We can't tell you how to do this, or give you the strength to finish this toxic relationship - that's down to you .... but think on - in a few short months your son will be starting to become aware of what goes on around him and he really doesn't deserve to feel like a piece of unwanted trash just because you're prepared to accept the way that his sperm donor treats you