David attempts to minimize the costs of his relationship with daniel while maximizing benefits. he enjoys daniel's company, but he tries to avoid him move. this is an example of the theory.

This would be an example of social exchange Theory
social exchange refers to how the interraction between two individuals is the result of cost-benefit analysis that happen between the two.
If, the individual believe that the sacrifice that he/she made is higher than the benefit, they may choose to stop the association with other individual.

Sorry wish i could