was interesting to him/her
Ahora sí que le interesaba mucho.
Now he was really interested.
Yo pensé que a usted no le interesaba.
I thought you weren't interested.
— El secreto de sus ojos (2009)
No le interesaba el pescado blanco, y a sus dos competidores tampoco.
He wasn’t interested in white fish, and neither were his two competitors.
Tom sabía que a Mary le interesaba.
Tom knew that Mary was interested.
"Ya, claro, solo le interesaba su libro".
Yeah, right, he was only interested in his book.
— Durante la tormenta (2018)