Do you mind sharing what she std was? Not to get too personal I just can't see how see would be able to hide the std for so long. I know there some that women find out about later like hpv that laid dormant for years w/o symptoms, but 15 years seems a long time. I'm inclined to believe it came from the affair.
ETA did you go to the prenatal appointments? Seems impossible to get around hiding it during pregnancy due to risk to the babies.
ETA did you go to the prenatal appointments? Seems impossible to get around hiding it during pregnancy due to risk to the babies.