Won't your H have to follow up with the state since they will be deducting child support from future paychecks? If he doesn't try to fight it, wouldn't that be an admission of something?

Does your H just act like the whole thing (the letter) didn't even happen or is he talking to you about it?

Are you sure that is healthy for you to continue on and not think about it? I know you probably need time to process it but I would think it would be in your best interest to deal with it in whatever ways you need to. Is there anyway that this woman could come after you for the child support since you and your H are married?