What does the interest relationship between lovers mean?

It means that this couple has more interests than ordinary couples rather than pure love.

For example, a boy falls in love with a girl, and the two sides are together because they are interested in each other's conditions, which is helpful to their career and family development, and then they are willing to associate. The interests involved are great. From the beginning, they went with a purpose. In the process of getting along, they pay more attention to what value the other party can bring to themselves, rather than loving someone sincerely. This relationship is hard to last. Even if it does, their hearts are not with each other.

Between lovers, love in two directions is the best, so that people can experience that kind of pure love.