Zaid Alsalami, Shaykh Dr Zaid Alsalami is an Iraqi born scholar, raised in Australia. He obtained a BA from Al-Mustafa University, Qom, and an MA from the Islamic College in London. He also obtained a PhD from... Answered 3 weeks ago

Bismihi ta'ala

Although you might have been young, but you must have known that talking ill about someone is a bad thing. If this person is still alive, and you do see him, greet him, and just say 'forgive me if I have wronged you', without going into details. 

I am sure he wont comment on anything, and answer in a positive way, and your conscience will be clear, in shaa Allah.

With prayers for your success.