Who else thinks glee is like an endogamic group?

seriously, who can explain me from all the characters who liked who,
or who has dated who?

Let's stick with the main characters

And if they were on and off name them twice like who got back with who

Starting from Mr Schuester, then Finn, Quinn, Artie, puck, Santana,
Rachel, Sam, Britney, Kurt, Mercedes, Tina, mike, and the rest