Spoiler AlertBuffy was killed by the master in episode 12 of season 1... by drowning....so Kendra was called, but Buffy was then revived by Xander...then Kendra died, which caused Faith to be...
SPOILER ALERT Buffy, Faith, Kendra and all the girls with the potential to be a slayer, so (in the comics) over 1,200 girls, some of which include Kennedy, Amanda, Rona, and Vi, although Amanda dies.
A strong argument can be made that Angel is her first boyfriend - by merit of the show's overall direction in the first three years. Those years are all about establishing that entire relationship....