How have you forgiven yourself for embarrassing actions done during a psychotic/manic episode?

Here's my story:
Last summer I had the worst manic episode of my life. But during that summer I had a conversation with one of my favorite professors, (who I suspected was bipolar...and upon confronting him, I turned out to be right!)

Anyway during that conversation I said and did some really confusing, embarrassing things. (For example I gave him the lyric booklet to one of my favorite albums because the lyrics reminded me of bipolar disorder) Anyway I'm so ashamed and embarrassed that I acted so unlike myself in front of him. I mean I know he's bipolar, but he didn't know I was having a manic episode at the time so he doesn't have an explanation for my behavior. I did apologize over email, saying I had been "unwell", and he didn't seem like he was bothered by my behavior since he didn't even address what happened, my behavior, or my apology over email. He and I have been keeping up an email correspondence for the past year, which has been great. (mostly discussing issues within our field of study)

He's become a real mentor to me, and it seems like he's overlooked the things I said and did that summer, but I'm still filled with so much shame. I rambled like a manic idiot in front of the person I respect the most in this world and I just hate my self so much. It's almost been a year now and I keep crying every time I think about this.

Anyway, I would welcome any suggestions on how to get over this!