I accidently deleated a friend off my friends list and don't remember the gamer tag cause it has a bunch of weird numbers in it is there a way to find it..
Did you add any friends of your friend ? If you did then try taking a look through their friend list for the friend you deleted ( yikes that's a lot of friends ) other than that you're a little stuck.
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BTW, this is not a Connections-Networking problem but an Accounts problem and Forum 03 is the best place for Accounts issues.