The best reference for you is noted in IRS Publication 596, which is where the Form 1040 Instructions lead as well.
IRS Publication 596 describes the earned income to use if you are filing jointly this year by combining earned income for each of you from the separate 2019 tax returns. This is the reverse of your situation. Without explicit language in the 2020 publication, the reverse would be to use your own earned income from the previous year.
If you meet all the qualifications to use the Head of Household status, then under the tax law you are 'considered unmarried'.
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