A spoiler was rooted in envy, jealousy and malice. She learns about the dangers of hatred, jealousy and vengeance. Green is often associated with jealousy and envy. It was this that incited her jealousy and hatred of Duncan. Some scholars believed that Cain's motives were plain jealousy and lust. " is an urban tale of "lust, jealousy and sexual disgust. Passions such as greed and jealousy are alien to him. These laws were enacted in fear of cuckoldry and thus sexual jealousy. Often, gender differences in both jealousy and infidelity are attributable to cultural factors. Studies suggest that dogs feel complex emotions, like jealousy and anticipation. This fills her with misery but also jealousy. They then become involved in angry altercations of jealousy and recrimination. Svanhild is married to Jormunrek, who later kills her on suspicion of jealousy. This rivalry begins with Gene's jealousy towards Finny. The relationship suffers from his overt and admitted jealousy.