mattered to him/her
¿Por qué le importaba la ruta que tomaría de regreso?
Why did he care which route he would take back?
Tom fingió que no le importaba que Mary saliera con John.
Tom pretended not to care that Mary was dating John.
¡Al día siguiente tuve mi examen, trabajo final, pero a nadie le importaba!
The next day, I had my final exam, but nobody cared!
— पीकू (2015)
A Tom le importaba.
Tom cared.
Lo único que le importaba a Tom era que no fuéramos maleducados con su jefe.
The only thing Tom cared about was that we weren’t rude to his boss.
No era que no venía nunca, que no le importaba?
Wasn't it that he never came, that he didn't care?
— Nueve reinas (2000)
A Tomás no le importaba que María tenga senos pequeños.
Tomás didn't care that María had small breasts.
La única cosa que en realidad le importaba al profesor eran sus estudiantes.
The only thing the professor really cared about was his students.