Welcome chicubs.
congrats on your decision.
My old drinking buddies were on my about this too when I first quit and in a strange way it only helped my resolve. I don't know whether it was my imagination or not but it almost seemed like they wanted me to fail.
As far as your best friendship that you want to repair I can't see much good coming from opening up old wounds at this point but I can see a blanket amend getting the two of you back on track. If he detects your sincerety he will likely give you a chance to make things right.
Hope this helps.
Good luck in your quest.