Finn Hudson
Finn's ex-girlfriend, Quinn Fabray

Kurt Hummel
Kurt's ex-boyfriend, Blaine Anderson (let's pretend that Kurt is bi)

Blaine Anderson
No one has any problem with your relationship

Quinn Fabray
Quinn's father, Russell Fabray

Rachel Berry
Rachel's ex-boyfriend, Jessie St. James

Arthur 'Artie' Abrams
Becky Jackson; she claimed she had Artie first

Noah 'Puck' Puckerman
At first, Santana Lopez and Quinn Fabray

Brittany Pierce
Santana Lopez, who's in love with Brittany

Santana Lopez
Her abuela, but she eventually accepts

William Schuester
There's just Sue Sylvester and Terri Del Monico, his crazy ex-wife