fiancee whom i am cargiver for is also my totaly disabled dependant and fiancee in my home.

[luckyducky429]

how do i file him?

[leeloo]

If he meets the qualifications below, you can claim him as a dependent. You will file as single. 

Qualifying Relative

You can claim a child, relative, friend, fiancé (etc.) as a dependent on your 2022 taxes as long as they meet all of the following requirements :

• You provided more than half of their financial support. More info
• They made less than $4,400 in gross income during 2022 unless they are a qualifying child.
• They live with you or they are related to you. (Your relative must live at your residence all year or be on the list of “relatives who do not live with you” in Publication 501.) 
• They are a U.S. citizen, resident alien, national, or a Canadian or Mexican resident.
• They aren't (or won't be) claimed as a dependent by someone else.
• They aren’t filing a joint return with their spouse.
• You are not being claimed as a dependent on someone else's return.

[xmasbaby0]

If he lived with you for the entire tax year you can claim him as a qualified relative and you will get the $500 credit for other dependents.   Claiming your BF will not make you eligible to file as Head of Household.   Sorry--but saying that he is disabled does not get you any other extra credits or deductions.

https://ttlc.intuit.com/questions/4499708-what-is-the-500-credit-for-other-dependents-family-tax-cre...