There used to be the options for US citizens married and living overseas to file single seems that option is no longer valid the IRS wants your married status with the hopes you add your non resident alien spouse.  They give many explanations to this through out the newly updated Tax instructions .  So check with your accountant again if you were filing single to see if you can still do this.

If you are married to a non-American and you both live overseas, you may have wondered how this impacts on your U.S. tax filing situation, if at all. As with most concerns involving taxes, the more complicated they can make it, the better Congress likes it! This article will try to present your various tax obligations (and options) with regard to a non-American spouse as simply and precisely as possible. via Non-American Spouse: US Tax Implications :: American Citizens Abroad ACA.