I think the expectation that deep romantic feeling will exist for every couple for all or most of the span of their relationship, is a very modern construct

In the agrarian world I think more emphasis was placed on what a couple could build (family, farm, business, legacy) and less on how the felt

That said, it’s obviously important, especially to women, that this feeling exist, at least early on, as a wellspring of positive regard toward her partner for her to draw from later, when the feeling has faded. Helps her to feel she made the right choice. At least done correctly.