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...
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