A bigamous marriage is void.
Quote Quoting Virginia Code § 20-43. Bigamous marriages void without decree.
All marriages which are prohibited by law on account of either of the parties having a former wife or husband then living shall be absolutely void, without any decree of divorce, or other legal process.
See also the unpublished case of Davidson v Davidson, Record No. 2356-08-3 (Va. App., 2009).

If you cannot agree on how to divide your "marital estate", and aren't willing to just walk away (I'm not suggesting that you walk away - but some people do), you will have to litigate that issue.