Forgive and Forget? Or Just Forget?

So, M and I had a weird night this weekend and I've been super annoyed for the past few days. Here I've been impatiently waiting for an apology only to find out that he doesn't even remember anything from that night. Hmmm. I'm not sure how to be angry with someone who doesn't remember the whole thing, especially when I've been in the situation (perhaps more than once) when I can't really remember anything either. Granted, it's not a free pass, but I think I just need to be mindful when things are escalating and leave the situation to avoid further conflict. It's all about learning about the other person and figuring out how to get along day-to-day, right? This stuff is hard. Shouldn't there be an instruction manual on how to understand another person? That would rule.