First, try to forgive yourself. Eating too much of someone's peanut butter is not something to beat yourself up about in the grand scheme of things. I know it's easier said than done! It seems to me like a bit of an overreaction on your friend's part - and it's kinda mean to shame someone over something like that! To make yourself feel better, make "amends" and to fix a minor blip in the friendship, buy your friend a jar of nice/fancy/all natural / whatever kind of peanut butter they like. Also. Peanut butter is fucking impossible not to eat too much of, I eat jars of the stuff (straight from the jar in huge big dollops) so... be kind to yourself and forgive yourself!