Xander Harris fell head over heels ( literally ) in
love with Buffy from the moment he saw
her.

He was the first person to learn about
Buffy's identity as the Slayer when he
overhead Giles and Buffy discussing
the body found in the locker room.

Xander has been Willow Rosenbergs best
friend for as long as either can remember,
and his interest in both Buffy and then
Cordelia put a strain on the couples friendship.