| Legally... you are the child's father - case closed.
you pay support and have rights to visitation. If she doesn't abide by the court order, she is in contempt, just as you are if you abruptly stop paying support, so at least petition the court to enforce visitation.
PS - morally, you have been the child's father since birth, correct? have you exercised your visitation? do you love him as yours?
If you answered yes to these questions, then the biological facts (although she is wrong for doing it) doesn't change the fact that you are a father to this child. Sure, you can be pissed at her and hate her, but think of the poor kid (someone who is not at all equipped in the first place to handle trauma like that) being told that the person known as "dad" is not and he's a product of rape. The tormenting feelings that result from that would tear MY world apart and I'm 29. I can't imagine what it is doing to that poor kid.
Good luck to you.
Jenifa |