Adnyl,
Sorry you are going through this; it is terrible to say the least!
I read your post a few days ago and I wanted to respond but needed to think about it from a logical stand point.
What you decide to do is up to you and this community will support you, whatever decision you make; no one will judge you. That being said, here is the blunt reality of this situation:
1) The child, not by the choice of its own, is still the product of an illicit affair
2) The child will always be a reminder of his infidelity and the horrible person who chose to have an affair with your H.
3) Your H is now responsible, at least legally, for this child. That will affect you both should you decide to reconcile & rebuild
4) you have another child (17 y/o) if I remember; this could have negative impact on her as well!
When it comes down to it, you have to decide what you are willing to tolerate and accept. What you are willing to forgive, but most likely, never forget! This is what it really boils down too! If you can accept the above bullets, and move beyond them, then that is up to you!
I know there will be mixed agreement with what I am about to say, but, even though you may want to R & R with your H, you do not have to accept this child in your home. You do not have to accept it in you H's life at all! Yes, he may have to support the child financially, but you do not have to accept it as part of the R&R process if that occurs and you can set those boundaries. It will then be up to him to make a choice.
I personally never had to deal with this; and due to our circumstances, we divorced anyway and I am completely done. However, if she had become pregnant with another man's child; instant deal breaker for me, period! Accepting & caring for step-children from a previous marriage is one thing; an "affair baby" is completely different !!!
Just my $0.02!
DO