To find a good relationship, you do not start by saying, “I want a relationship that looks like this”—that would be starting in the wrong end, by defining form. Instead you say, “I’m just going to pay attention to what happens when I hang out with various people and iterate toward something that feels alive”—you start from the context.
When you design something, a useful definition of success is precisely that— the form fits the context —as Christopher Alexander argued in Notes on a Synthesis of Form (1964). This is true of relationships, and essays, and careers: you want to find something that fits .
A glove is well-designed if it fits the hand nicely.