In Cursed, we take a bite into Angel’s dark, deathly, and Darla-filled past.
Buffy and Angel are fighting vampires at a cemetery. After a vampire recognizes him, Angel reminisces with Buffy about when he was sired by Darla. He tells her when he first awoke as a vampire and killed an old friend Liam McHugh, who had been searching for him since his disappearance. Angel describes his pleasure in bringing death and terror in his path alongside Darla. Buffy notes that, despite his guilt and horrifying memories, he wasn't the same from before the soul. Angel, though, explains that his curse is more than guilt: these memories were about his pleasure.
In 1753, Angel was referred to as "Angelus" by his human friend, an alias he used only after he became a vampire ("The Prodigal").
Angel - “Buffy, you still don’t get it, do you? There's more to the curse than the guilt. All those things I did… While it was happening, it was sheer pleasure, every minute of it. Much as it sickens me… they’re good memories.”