There’s sadly no way to see if one of your contacts has deleted you as a friend, however there is a way to see if anyone has ignored your friend requests, even it is was many years ago!
This is how you do it!
1. Click on the Friend Requests icon in the top-right corner of the screen.
2. Click on “View Sent Requests”
3. Now you have the list of the people you have added as a friend and have not responded. Warning: it is VERY possible you don’t even remember adding these people!