Love and you shall be loved. All love is mathematically just, as much as the two sides of an algebraic equation.

Affection given tends over time to come back, though rarely from the direction it was sent and rarely on the schedule you would choose. The accounting works out across a life rather than in any single relationship, and anyone who has loved without return knows that difference. What holds honestly is that people who give warmth end up surrounded by more of it than people who wait to receive it first.

If you are keeping score with somebody, consider putting the ledger down for a week. Give the thing you have been withholding until they go first. It may not come back from them, and it usually comes back.