Usually humans are very loyal to their inner circle. Inner circle is the closest surrounding of an individual - close friends and closest family members. Since we are not telepathic and since there is a lot of deception, the only way we can tell the loyalty of people to us is by testing their loyalty over time. So our loyalty is empirical and dictated by practical reasons. Typically humans keep friends from school years - that is from high school (age 15-17) and college (age 17-22). (These ages are shorter in poor countries, since there, people develop and age faster). Due to our nature, most stable connections are formed at this time. Part of this is generational and part of that is common experience during the years we are formed. People who studied together in the same high school and college understand each other best, are best sexual mates, and trust each other most. Very often we group in school and high school in small groups of about 2-8 individuals and keep close loyal connections the rest of our lives. Loyalty is very important to us. Since we are very lonely and isolated, since we have typically no information coming from higher spheres (God, angels and spirits), we communicate most with our close friends. This communication becomes very intense and sophisticated. There is huge diversity in it, and it is a large part of our life experience. Communication with close family and close friends is the best experience human souls have on Earth.