Harry - His ex - Ginny
Your ex - Neville
Ron - His ex - Lavender
Your ex - Seamus
Hermione - Her ex - Victor Krum
Your ex - No one
Ginny - Her exes - Dean Thomas, Michael Corner
Your ex - No one
Luna - Her ex - Neville
Your ex - Ernie Macmillan
Draco - His ex - Pansy
Your ex - Victor Krum
Fred - His ex - Katie Bell
Your ex - George
George - His ex - Angelina Johnson
Your ex - No one
Cedric - His ex - Cho Chang
Your ex - Ron