facebook friend request ??

[XxpinkxX]

on facebook if you add somebody as a friend and they decline when you go on their profile can you add them as a friend again? i added someone as a friend on facebook they are in some of my classes so they know who i am but we haven't talked yet because its just after summer so new classes, i added them 3 days ago then i clicked on their name by accident because their name was in my news feed and on their profile it said 'add as friend' so did they decline? i dont get why they would like hate me should it not normally say 'friend request sent' if they havent answered yet, this is really annoying me i think i might have added them before like a year ago as well