Wishing to try his luck as a music producer, he moved to the United States where he tried to relaunch the career of singer Esther Galil.
Meanwhile, in 1992, he participated as an "anonymous" candidate in the game Que le meilleur gagne presented by Nagui on La Cinq.
On 21 September 2002, he married the television and radio host Flavie Flament who he met in December 2000 on the show Les P'tits Princes (on TF1).
They divorced in May 2016 and on 27 August of the same year he married an interview director of the company Endemol, Aurore Aleman, met in 2015.
On 23 June 2012, Castaldi was involved in a motorcycle accident where he suffered a collarbone fracture and two broken ribs.
In 2012, Castaldi discovered that he was ruined and claimed to be a victim of a real estate scam of the financial consulting company Apollonia.