It doesn't affect you, or the validity of your marriage. Under s28 (3) Matrimonial Causes Act 1972, if a divorced person remarries, they can no longer seek orders for financial relief in respect of the first marriage.
If your husband ticked those boxes in his Petition, then he is probably ok to seek property adjustment orders even now. There are arguments that even then, he can't, but the preponderance of opinion would I think be on his side.
If he didn't tick the boxes, then his only hope is an application under Trusts of Land and Appointment of Trustees Act. Whether he can use such an application is also subject to some legal debate : there are statements in judgements both by Lord Justice Thorpe, one suggesting he can't, one suggestIng he can. Cheers for that, m'lud.
Personally, I find it hard to believe the court would permit a situation to arise where your husband is left with a joint asset and no remedy but the death of himself or his former wife, but I'm just a simple minded solicitor, not a learned judge, so what do I know?
On a practical note, please tell me your husband has severed the joint tenancy of the house, and made a Will leaving you his share? If he hasn't, then please, don't lift another finger to show him the slightest kindness until he has, since if he falls under a bus, your whole home belongs to his ex.