I think it means "the person whom love fits (= joins) to us".
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NL888Does "The person love does to us fit" mean "The person does love to fit/suit us"?Not exactly.
NL888So1) "The person" = Love (in the lines of the poem)?No. The person is not love. Love brings one person together with another person. Said poetically, love fits one person to another person.
NL8882) "love does to us fit" means "love does us to fit each other"?No. You don't seem to have the meaning yet.