Maryland has abolished the traditional laws which would render a bigamous marriage void ab initio (from the beginning), so it appears that your dual marriage won't of itself void your current marriage. (Your spouse could seek an annulment.)
I suggest getting help from a family lawyer to complete a divorce or annulment of your first marriage, and inquiring with your lawyer as to whether you and your spouse should take steps to actively reaffirm your second marriage.Quoting Ledvinka v Ledvinka, 154 Md. App. 420; 840 A.2d 173 (2003)

