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9) When Candace tells Sam he will be unfaithful was she right or was she just projecting her own fears on Sam. Was she sensing what eventually had Sam use the demon blood and release Lucifer, or was she only justifying herself?
Elle - Justifying herself. She tempted everyone and had serious man issues. She had to kill cheaters, it was her thing. I doubt she sensed anything about Sam in that moment - she was too self-focused and absorbed in her own sins.
Elle2 - I think Candace was able to pick up on the emotions of the men she came into contact with. We already know that Sam hadn’t told Jessica about his past, and we later learned that he’d had a dream of her death before Dean even came to Stanford, so he would have had uneasy feelings, perhaps even guilt in regards to Jessica. I think Candace picked up on those emotions and, due to her being so long in the “veil” and getting more and more insane – as we later learn happens to spirits who don’t move on – that she just assumed that to be unfaithfulness and thus targeted him.
Metamorphic Rocks - I think she was referring to her certainty that Sam would fall prey to her powers of seduction. Ultimately, Sam didn’t respond to her in that way, though she still tried to kill him.
I hadn’t thought that the writers might be foreshadowing Sam's later behavior with Candace's comment, but that’s another interesting idea. However, regarding Sam’s loyalty to Jessica, its enduring nature is evident in 1.7 “Hook Man,” when he tells Lori “I can’t,” when they start to kiss. Dean even verbalizes his concern about Sam’s reluctance to get involved with anybody after Jessica in the latter part of Season One, so by all accounts, Sam remained faithful even longer than he had to.
Percysowner - I personally think that Candace was projecting on Sam to justify her attack.