The most jealous zodiac sign is generally considered to be Taurus. Taureans are very possessive of their loved ones and can be quite territorial when it comes to their relationships. They may feel threatened if they feel like someone is trying to come between them and their loved ones, and they may react with jealousy. Taureans also have a strong desire for stability and security, which can make them possessive of their relationships and resources. Additionally, Taureans have a tendency to be stubborn and unwilling to compromise, which can make it difficult for them to let go of their jealousy and work through relationship issues.