Can anyone please tell me what the difference between "have been" and "was" in the following sentence is?
Here is the text:
I have been/was a big fan of Tottenham football club but from now on I will never support the team. It is because of the rude behaviour to other footballers in the last match a have come to this conclusion.
Note that before that incident happened, I was a big fan of the team. I am not a fan any more.