According to astrology, there are 3 zodiac signs that can take you by surprise. These zodiac signs are believed to be the least loyal zodiac signs. Sagittarius: loves adventure! They tend to thrive on exploration and they cannot help but live life on the edge. On the other hand, they also have a deep desire to constantly make new friends, and to try something new every day. Making & keeping promises is quite tough for these individuals. It is impossible for this sign to commit in a relationship, as these people do not like to be caged in a relationship. Aquarius: These guys are not great when it comes to emotional intimacy. They understand the responsibility of being emotionally committed and hence try to tread the surface of the heart, rather than dive deep into the thick of things.