You should be able to view friend requests you’ve sent, and you should be able to revoke them.
I’d say they should be shown on the “Friends” page. This is how it should look like :
“Friend Requests” & “Friend Requests You Sent” should be clickable.
You should add this feature because some users want friends they know in reality and they don’t want online friends, lets say they sent lots of friend requests in the past and now they don’t want those users to accept the friend request anymore.