I don't know the answers about letting the divorce go, etc. But I would advise you not to let him get into a habit of using the child support as some kind of bargaining chip, or the withholding of it as a threat to you.
I've noticed in my situation that W can be very vindictive when angry and takes it out anyway she can. If he tries that with the child support, I'd recommending taking some type of action immediately.
