I helped transfer my friends numbers and photos on my PC with apple consultant ant. Everything went fine until I pressed something today and he got all my contacts and he got all mine..........if I delete a number of his it deletes it from my phone...I hI
If two devices/computers are connected to the same icloud address, then they will sync all changes (i.e. they will be clones of one another).
If your friend is logged into your icloud account or you are logged into his account, then the result will be what you described.
iCloud mess up
