I'm feeling much better now. I did all the emotional processing I needed to do (or all I could handle right now, so the rest was put in storage, I'm not sure). I didn't come to any revelatory conclusions except that it's ancient history and not worth rehashing. It's better to just move on and hope I'm not so foolish next time. Things change. Circumstances change. People change (even the ones who don't think they do).
Thank goodness I can change.