If by "significant other" you mean a GF or BF, then no, you do not enter their income on your own tax return. We need clarity---are you legally married or not married? If you are not married and want to claim an adult dependent----they must meet the criteria to be a "qualifying relative"
Did the "significant other" live with you for the entire year in 2022? Did they have less than $4400 of income in 2022--not counting any Social Security? If the criteria to claim them is met, you get the $500 credit for other dependents when you claim them.
CREDIT FOR OTHER DEPENDENTS
https://ttlc.intuit.com/questions/4499708-what-is-the-500-credit-for-other-dependents-family-tax-cre...
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