Generally speaking your marital status is whatever it was at midnight on December 31st.
You can file as 'Head of Household' if you have a qualifying child, are claiming that child as a dependent AND you didn't live with your spouse for the last 6 months of the year.
Unfortunately, August doesn't quite qualify. So in your case you will file as married filing separately for 2023 and - unless you remarry - single for 2024.
@jessleighc
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