(not a teacher)
The article's point is that being able to easily back out of a "romantic commitment" actually detracts
from our ability to enjoy them. When we make "romantic mistakes", we're more inclined to think we've blundered in
our choice of initiating a romantic relationship with that special someone. The study mentioned in the article is suggesting
that the mind has a "what's done is done" switch that helps us feel we've made the best decision we possibly could and
bear any perceived "mistakes".