Filing Status Question - Unique Situation

Hi,

 

State of residence: Ohio

 

My "wife" and I have been living apart for years, although not legally separated or divorced.

She is filing as head of household, and meets the IRS requirements including the "unmarried" part because I did not live in the household for the last 6 months of the year.

This may be a silly question, but wouldn't the IRS consider me unmarried as well by default? Therefore, shouldn't I be able to file as single?

 

Thanks for any help!