I have been told that my 26 year old wife has been having an affair with two teenage boys having sex with them regularly and has been make pregnant by one of the boys.
She has told me that she is going to keep the baby and that she is in love with one of the boys and will still carry on seeing them, even though I want her to stay I would forgive her and bring her baby up as ours.
Do it. Keep her and raise the baby as your own. but let her keep her lover too.
Let her bring him around whenever she likes and get used to him being her preference.