4 boys, 4 girls so tight in HS that they all agreed they were going to get "8" tattooed on their ankle. I told DS that was a great plan if they were still friends after college. DS still got the tattoo on his own

(he was 18).
DS is still close with two of the boys as a junior in college. 3rd boy did something that showed really poor character 2nd year in college and whole group dropped him. Girls are all scattered, and one or two may not be in the friend group at all anymore. DS will still be close friends with one of the girls (neighbor and friend since they were 4), not sure about the other girls. Dating relationships (with new people) definitely upend HS friendships.