“The most successful relationships consist of compromises regarding expectations; all expectations are not equal, and therefore in each case one must judge the level of their individual desires.”
1986
Related quotes

attain targets while satisfying constraints
Simon (1997, p. 17); As cited in: Gustavo Barros (2010, p. 460).
1980s and later

Source: Better-World Philosophy: A Sociological Synthesis (1899), The Social Ideal, pp. 146–147

“With regard to donations always expect the most from prudent people, who keep their own accounts.”
This is attributed to Addison in The Columbia Dictionary of Quotations (1993) with a citation of "Economy and Benevolence" in Interesting Anecdotes, Memoirs, Allegories, Essays, and Poetical Fragments (1794) but that was a publication of a contemporary "Mr. Addison" in several volumes, and not the poet. Vol. III of that publication (in 1796), on page 205, does contain these lines, but as part of an anonymous ancecdote.
Misattributed

Source: Galateo: Or, A Treatise on Politeness and Delicacy of Manners, p. 27
Source: A Funeral for the Eyes of Fire (1975), Chapter 7, “Interlude: Heartseed and Tower” (p. 142)

“The joy of losing consists in this: Where there are no expectations, there is no disappointment.”
2010s, 2010, The joys of losing (2010)