So had this issue as well. A quick scan on the DB and I found a sProc
dbo.activesocial_Messages_DeleteFriendRequest @SenderId @UserId I executed it but I still see
"Friend request pending"
So I went to the activesocial_Friends table found the FriendId and UserId and set the IsRejected field from True to False.
Now I still see
"Friend request pending" 
but request could now be confirmed

.