Do the narrator and Sheila Mant make a good couple in "The Bass, the River, and Sheila Mant"?

Definitely not. We can see that the attraction the
narrator has for Sheila Mant lies primarily in the spell she casts over him, the way
that she is associated with beauty, parties, and popularity. Consider how the narrator
views her at the end of the story, just before he cuts the line, in the
moonlight:

Not
just Sheila, but the aura she carried about her of parties and casual touchings and
grace.

It is this that makes
the narrator attracted to her. As the story progresses we see Sheila for who she really
is: a egotistical, narcissistic and self-obsessed individual. Note her reaction when the
narrator tells her there are bats. Also consider the way that when she talks she only
refers to herself. The following is a classic example of her
selfishness:

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"I have to be careful with my complexion. I tan,
but in segments. I can't figure out if it's even worth it. I wouldn't even do it
probably. I saw Jackie Kennedy in Boston, and she wasn't tan at
all."

This shows how she is
driven by fashion and popularity, and thus we can understand why the narrator
symbolically cuts the line, letting the tugs on his heart that Sheila's attractions
exert on him vanish and disappear.