If you were unmarried as of 12/31/2017 you are considered unmarried for the year and will file as either single or Head Of household if you meet the qualifications for Head of Household.
Here is a link with information on filing as Head of Household.
https://turbotax.intuit.com/tax-tips/family/guide-to-filing-taxes-as-head-of-household/L4Nx6DYu9
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