Relationships require trust, loyalty and faith. Without these major foundation pillars, any bond is set out to crumble. And then feelings of jealousy, betrayal rise up, making it difficult for people to behave rationally in relationships. Some people become so insecure that they end up spying on their partners because they don’t trust them. This act alone is a huge red flag. Through astrology, it has become possible to identify such people by determining their personality with the twelve astrological zodiac signs. Hence, here are some zodiac signs who are likely to spy on their spouses.