Trying to explain why I got upset, I went on and on and insulted someone I care for?

Best to just apologize sincerely for the way you said things, apologize for insulting him and something like "I had no right to berate you like that and for that I apologize." That is not saying you think you're wrong, but it is apologizing for what appears to be one heck of a slandering. Definitely take the initiative, god won't help you out here and your friend won't know if that's the only entity you apply to for forgiveness. Best to make your apology and end the friendship.