If i paid !00% of household expenses , my dependent 0% , why must i file as single status ?

[xmasbaby0]

Who is your dependent?   If you are trying to file Head of Household, the dependent cannot be a GF or BF.  The dependent must be a qualified, blood-related dependent.

Am I Head of Household?

https://ttlc.intuit.com/questions/1894553-do-i-qualify-for-head-of-household

https://ttlc.intuit.com/questions/2900097-what-is-a-qualifying-person-for-head-of-household

If you qualify as Head of Household, when you enter your marital status (single or married filing separately) into MyInfo, and then enter your qualifying dependent, TurboTax will offer HOH as your filing status.

[DoninGA]

Are your dependents related to you?  Are you Married or Single?