I've posted this years ago, but since we have new fans here, I'd like them to read my thoughts on Xander's different reactions to the idea of Buffy and Spike in different parts of the show:
Xander's Reaction Before Hell's Bells:
In Intervention, Xander and Anya saw Buffybot (thinking it was Buffy) having sex with Spike. His reaction was quite understanding and sympathetic. I believe that since things were going so well in Xander's life, he was able to see more objectively and rationally. Xander had the girlfriend, the steady job and the apartment, he's got it all now, which is why he was well-headed enough to accept Buffy's "fling" with Spike. "No one is judging you. It's understandable."
Xander's Reaction after Hell's Bells:
Xander had taken the news hard, made a big fuss, because things weren't 5 by 5 in Xander's life. He's been going through depression since the demon violated his mind in Hell's Bells. He lost Anya, he lost his self-respect, he started drinking, his apartment looked like a dumpster, and Anya wouldn't give him a second chance. Not to mention, he learned about Buffy and Spike after he saw Anya having sex with Spike, so two blows in the same night for a depressed man? Yep, depressed man acts crazy. Depression does that to you, ask Buffy.
Xander's Reaction Post-S6 but Pre-Conversation with Dead People:
Xander wasn't happy about Spike being back in their lives, but he didn't make that much of a fuzz. There wasn't that much of hostility when Spike came back with a soul. Xander was still upset about the attempted rape, which is justified, but he didn't attempt to push Spike away against Buffy's will. A few heated discussions with Buffy and snide remarks at Spike, which was still a progress from the axe of last year. Things changed so much after Xander was placed in the same position Buffy was in in Becoming. Anya was murdering people in Selfless, and she needed to be dealt with. Buffy decided to kill her, and now Xander could understand what Buffy went through that time. That helped him gain a sense of understanding towards Buffy's feelings for Spike, and enabled him to accept taking Spike in later in the episode Him.
Xander's Reaction Post-Him:
All the negativity seemed to have vanished. There were a lot of incidents that showed Xander seeing the picture with unbiased eyes, his new found trust in Buffy's choices and decisions regarding Spike made him a more supportive and understanding friend. He could see now beyond the hate and anger, he was able to see when others (Anya, Dawn and even Willow) weren't able to. When Spike started killing (under the control of the First) Dawn and Anya wanted him out, Willow figured that William the Bloody was back, however, Xander thought that Spike was triggered. It wasn't Spike's fault.
So, this was a gradual character-development for Xander Harris, whose progression needs to be seen through a telescope. It is hard to see how much Xander has grown and changed at first viewing of the series, unless you're a hardcore Xander fan, which I am.
Xander's Reaction Before Hell's Bells:
In Intervention, Xander and Anya saw Buffybot (thinking it was Buffy) having sex with Spike. His reaction was quite understanding and sympathetic. I believe that since things were going so well in Xander's life, he was able to see more objectively and rationally. Xander had the girlfriend, the steady job and the apartment, he's got it all now, which is why he was well-headed enough to accept Buffy's "fling" with Spike. "No one is judging you. It's understandable."
Xander's Reaction after Hell's Bells:
Xander had taken the news hard, made a big fuss, because things weren't 5 by 5 in Xander's life. He's been going through depression since the demon violated his mind in Hell's Bells. He lost Anya, he lost his self-respect, he started drinking, his apartment looked like a dumpster, and Anya wouldn't give him a second chance. Not to mention, he learned about Buffy and Spike after he saw Anya having sex with Spike, so two blows in the same night for a depressed man? Yep, depressed man acts crazy. Depression does that to you, ask Buffy.
Xander's Reaction Post-S6 but Pre-Conversation with Dead People:
Xander wasn't happy about Spike being back in their lives, but he didn't make that much of a fuzz. There wasn't that much of hostility when Spike came back with a soul. Xander was still upset about the attempted rape, which is justified, but he didn't attempt to push Spike away against Buffy's will. A few heated discussions with Buffy and snide remarks at Spike, which was still a progress from the axe of last year. Things changed so much after Xander was placed in the same position Buffy was in in Becoming. Anya was murdering people in Selfless, and she needed to be dealt with. Buffy decided to kill her, and now Xander could understand what Buffy went through that time. That helped him gain a sense of understanding towards Buffy's feelings for Spike, and enabled him to accept taking Spike in later in the episode Him.
Xander's Reaction Post-Him:
All the negativity seemed to have vanished. There were a lot of incidents that showed Xander seeing the picture with unbiased eyes, his new found trust in Buffy's choices and decisions regarding Spike made him a more supportive and understanding friend. He could see now beyond the hate and anger, he was able to see when others (Anya, Dawn and even Willow) weren't able to. When Spike started killing (under the control of the First) Dawn and Anya wanted him out, Willow figured that William the Bloody was back, however, Xander thought that Spike was triggered. It wasn't Spike's fault.
So, this was a gradual character-development for Xander Harris, whose progression needs to be seen through a telescope. It is hard to see how much Xander has grown and changed at first viewing of the series, unless you're a hardcore Xander fan, which I am.