The episode 'Seeing Red' is infamous in the 'Buffy: The Vampire Slayer' fanbase for two reasons: Tara is killed by Warren and Spike attempts to rape Buffy.
Spike, Buffyverse Wiki
BtVS rewatch: SEASON 7 - BuffyForums
Why Spike ruined Buffy the Vampire Slayer
I Just Now Saw: Buffy The Vampire Slayer
Blood and Fog (Buffy the Vampire Slayer): 9780743400398: Holder, Nancy: Books
I Just Now Saw: Buffy The Vampire Slayer
I Just Now Saw: Buffy The Vampire Slayer
Blood and Fog (Buffy the Vampire Slayer): 9780743400398: Holder, Nancy: Books
Spuffy Ms. Ocampo Writes
Were Buffy and Spike ever actually in love? - Quora