Lelouch & Suzaku (Code Geass)

Suzaku Kururugi is the first and last true friend Lelouch had ever had. Lelouch trusts and has faith in him more than any one else (excluding Nunnally) in the world. He is even willing to go down on his knees to beg him to protect Nunnally because Suzaku is the only person he could trust and find help in, despite the fact that they were already enemies at that time. Lelouch was also hurt deeply when Suzaku decided to turn him in to the emperor and when he thought Suzaku had betrayed him again in the Kururugi shrine.