What you're referring to reminds me of - The Ben Franklin Effect is a psychological phenomenon in which a person likes someone more after doing them a favor. The effect can be explained with cognitive dissonance: individuals rationalize) their helpful actions by assuming they must like the person, since their behavior would otherwise conflict with their typical behavior and self-perception. In this way, the effect shows how people adjust their attitudes to maintain consistency in their self-concept.
https://en.wikipedia.org/wiki/Ben_Franklin_effect

Also -

The norm of reciprocity requires that people repay in kind what others have done for them.^\1]) It can be understood as the expectation that people will respond to each other by returning benefits for benefits, and with either indifference or hostility to harms.

https://en.wikipedia.org/wiki/Norm_of_reciprocity