In a fit of frustration, she turned on Angel.
Initially an ally to the main characters, events take a toll on Faith's sanity and she slips into a villainous role. Later storylines show her feeling remorse for her past crimes, and with the benevolent vampire Angel's help she eventually rejoins the side of good in the hopes of achieving redemption.
Angelus terrorizes Willow and the Gang at school, emotionally tormenting Buffy. Later, as they discuss Angel's transformation in the library, Buffy realises that having sex with Angel is what caused him to turn evil. Buffy has a dream in which Angel indicates that Jenny knows more than she is letting on.
Kakistos leads an attack on the pair. Mr. Trick leaves the fight halfway through, while Faith and Buffy kill Kakistos. In the library later, Buffy reveals to Willow and Giles that Angel's soul was restored just before she had to kill him.
He called in the Watchers Council to apprehend Faith, and a special team attacked and briefly captured her. Traumatized by the incident and isolated from the people she trusted, Faith went to the dark side. She turned to the villainous Mayor, Richard Wilkins, offering to help him in his plans for his demonic Ascension.
After Buffy and Angel saved her, Faith decided to surrender to the police and face the consequences for her actions. Faith was convicted for two counts of murder and received a life sentence, of which she'd serve at least twenty-five years.
Angel/Angelus
Angel lost his soul twice: first, when he slept with Buffy Summers, and again, due to a spell.
Angel killed him and finally recognized Buffy afterward, and regained his sanity. Though the Scooby gang do not trust him after he went bad, Angel manage to win back some good faith and acceptance in the gang after he saves Willow from being killed by the corrupt former Watcher Gwendolyn Post.
Angel had to strip himself of his soul and revert to his evil alter ego in order to defeat it, after "Cordelia" had a vision of Angelus facing the Beast in the past which Angel did not recall. As Angelus, he lures Faith to the Beast, only to betray and kill him, not knowing it would bring back the sun.
Angel kills the demon. Its blood, eventually found to be the Blood of Eternity, merges with his own, and he becomes human. Realizing what this means for their relationship, Angel spends the night with Buffy.
A Hole In The World
Upon discovering that releasing the spirit would kill thousands, they had no choice than to allow Fred to die. Her heroic sacrifice remains the show's most heartbreak moment and one of its saddest episodes. Fred's death hit Wesley the hardest, as they had just become a couple.
"Becoming, Part Two" is the season finale of the second season of Buffy the Vampire Slayer television show, and the thirty-fourth episode in the series. Written and directed by Joss Whedon, it originally broadcast on May 19, 1998, on The WB network.
Feeling overwhelming affection and sympathy for her, Angel was motivated to start his path as champion and help her in her fight against evil. A year later, he moved to Sunnydale. When reflecting over this, Angel eventually admitted to Buffy he fell in love with her the moment he saw her.
However, Faith Lehane (Eliza Dushku) eventually proves herself as the second most powerful Slayer after Buffy.
However, various events (particularly Cordelia's possession by Jasmine) kept them from admitting their feelings to each other, although shortly before Cordelia died, they revealed their love for one another and shared a single kiss. She died loving Angel, knowing that Angel loved her back.
She lived in a motel and didn't attend school. Many of Faith's actions isolated her from the group. Buffy was everything that she could have had and no matter what, Faith found that she was lacking in some way. She pushed away Buffy's attempts at friendship because she didn't feel like she was good enough.
He gives Buffy the amulet and offers to be the one to use it, but then finds out about Buffy's relationship with Spike, and that he's no longer the only vamp around with a soul. Bit of a tough visit for Angel. Spike ends up using the amulet, sacrificing himself to save the day and defeat The First.
Only two vampires had survived the Killer of the Dead, the second being Angel, who was cured by the blood of Buffy Summers after being infected with a poisoned arrow by Faith Lehane. To do so, Buffy had attempted to capture Faith to use her blood, but Faith escaped by falling on a passing truck after she was stabbed.
However, their relationship is complicated by the fact that Angel is himself a vampire cursed with remorse and a human soul, which motivates him to assist Buffy in her duties as Slayer.
In the season finale, Cordelia arranges to meet Angel to confess her feelings, but is prevented from doing so by Skip, who informs her that she has become a higher being. Cordelia accepts her duty, and leaves Earth for another dimension.
Canon is that Angel loves Buffy, but due to the curse on him, they cannot be together because if truly happy, he goes back to being Angelus.
As The Beast causes fire to rain from the sky in an apparent apocalypse, Cordelia sleeps with Connor to give him some happiness before the end.
Cordelia fell into a coma giving birth to Jasmine, and a season later she died offscreen in a hospital bed, the events leading up to her death erased from history.
Season two, episode 14 – Innocence
After Buffy and Angel sleep together, Angel loses his soul, reverting to his supremely evil Angelus persona and teaming up with Drusilla and then villainous Spike.
The group all take care of their targets within the Circle of the Black Thorn, each of them being killed one-by-one, although Wesley dies as a result. That's not the end of the battle though, as the Senior Partners send an army of demons down to Earth.