Angel's intent is to martyr himself for the greater good of humanity, like Jesus, but Wes is not an analog for the disciple who denied Jesus three times, Peter, the "rock" upon which the Christian church was built.
I think the "betrayal" line is actually a reference to Judas -and Wes does "betray" Angel in the sense that he gains access to Vail's private rooms by pretending that he's come there to sell Angel out. Since Spike isn't allowed to be Judas, he asks for the role of Peter instead. I don't honestly think there's more to it than the joke that Spike is still pretending he hasn't got Angel's back, even though we all know he's firmly in the loyal sidekick role. Just a bit of banter before battle.
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Angel's intent is to martyr himself for the greater good of humanity, like Jesus, but Wes is not an analog for the disciple who denied Jesus three times, Peter, the "rock" upon which the Christian church was built.
I think the "betrayal" line is actually a reference to Judas -and Wes does "betray" Angel in the sense that he gains access to Vail's private rooms by pretending that he's come there to sell Angel out. Since Spike isn't allowed to be Judas, he asks for the role of Peter instead. I don't honestly think there's more to it than the joke that Spike is still pretending he hasn't got Angel's back, even though we all know he's firmly in the loyal sidekick role. Just a bit of banter before battle.