That why someone behaves a certain way is only important inasmuch as it determines whether they’ll keep behaving that way.
Examples:
Criminals don’t need to be punished but rehabilitated; because blame and guilt aren’t important; recidivism is.
Your lover might have all sorts of reasons they love you, and some of those may seem very romantic and some might seem as unromantic as can be. But as long as they will keep living you, that’s what’s important.