Javier is Marito's best friend. The two are very close, and early in Marito's career, Javier was the only one Marito would share his writing with. Javier gave Marito honest criticism, and Marito accepted it. He was also the first person to find out about Marito and Julia's relationship, and after Marito's family learns of their marriage, they go straight to Javier to find him.
Aunt Julia and the Scriptwriter