di cui ti parlavo

that I was telling you about

→ di
phrase Rare #40,111
that I was telling you about Used in a relative clause to refer to a person or thing previously mentioned or being discussed. The phrase can mean “whom I was telling you about” when referring to a person.
IT: Ecco il ristorante di cui ti parlavo.
EN: Here is the restaurant I was telling you about.

Quello di cui ti parlavo.

The one I was telling you about.

— La La Land (2016)

Ti ricordi di quella ragazza, Joanna, di cui ti parlavo?

Do you remember that girl, Joanna, I was telling you about?

— Prova a prendermi (2002)

C'è quella perfetta cameretta di cui ti parlavo.

There's that perfect little room I was telling you about.

— La vita straordinaria di David Copperfield (2019)

Era l'amministratore delegato di cui ti parlavo.

He was the CEO I was telling you about.

— Vi presento Toni Erdmann (2016)