Please pray with me eugman,.. to Saint E. T. Jaynes:

Saint Edwin, I pray for rationality as I begin this day, for I understand there is uncertainty in probability models to be reduced, priors to be corrected, superstitions to be squelched and suckers to be Dutch booked. Grant me the courage to be alert so that that I may correctly hear P(B|A). Thy voice; to persevere, that I may share Thy victory; and to remember, lest I forget the way by which Thou has led me. And when this day is done, Saint Edwin, may I have the courage to see Thy guiding hand in the laws of conditional probability, in the significant features of subjectivist position that have been healed, and in the foundations of statistical inference that have been given.

Amen.

Any advice on getting back to normal?

Well, you might not be "back to normal" for a long time if you recently broke up with a fiancée. Don't be in a rush to undo whatever epistemological habits you've built up; don't forget the relationship between reversed stupidity and intelligence. I suggest getting your emotional house in order first, which may take a while.

I don't believe in a single one So, you didn't improperly raise your probability estimates of the existence of ghosts, etc.? That's great, but II hope that's because she didn't bring up any previously unaccounted-for evidence in favor of them instead of confirmation bias (here to be understood as discounting evidence that blows from the "wrong" quarter). Can you be more specific about her "perverse logic"? I for one would like to see more real-life examples of the Dark Arts, and resistance against them.

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I think you are recovering fast, otherwise you wouldn't care so much. Maybe you will gain a net win here. Think about it all as an immunization event against such influences in the future.

Going to a meetup would help, if one is in your area. Just being around people who thought more "rationally" than I did improved my thinking.

If not, have you read the sequences yet? This would be an excellent time to do so. Even if you have, rereading some of the more pertinent ones might help.

I've completed a first draft of the post based on this, in case anyone would be willing to provide suggestions.

Please don't be offended, this is not my intention at all, rather I intend to offer what I believe are valid suggestions.

Obviously, you like and love many things about her, yet you two were ultimately incompatible. In my experience partners often compliment each other in both good and bad ways. I suggest therapy because, to be perfectly honest, it's quite likely you have about as many problems as her(just different ones) if you were with her long enough to get engaged.

I also suggest an excellent book called The Erotic Mind. You (presumably) have a high degree of sexual compatibility with her, yet now you have broken up and it's highly likely that your sexual dynamic contained unhealthy elements, was probably turbulent at times, etc. This book has helped me tremendously in figuring out my sexuality, learning to love my sexuality, not feeling inhibited or ashamed of my fantasies, and it gave me a lot of insight into the dynamics of my relationships.

I have a thousand words so far for my post, if anyone is interested in helping early on in the process. Right now it's a giant jumble, there's no structure yet. That'll be next week. I'm just trying to get the thoughts all down.

Humans tend to become more like those they spend a lot of time with. As you apparently discovered. This works both ways. Spend more time with skeptics IRL. Also listen to rational/skeptical podcasts, surf LW, etc, but by far the IRL aspect is the strongest and most important.

Being afraid of the dark or being alone are both symptoms of loneliness. You might just be emotional. So I'm not persuaded that you have the problem you think you have.

Sounds to me like you withheld arguing with her on these matters and so got out of practice debunking the irrational.

If it's correct that you are just suffering a lack of practice of rationality then it's pretty simple to retake up your rational training and things will swing back towards normal.

From an evolutionary psychology viewpoint and given that humans are imperfect actors how you behaved was normal for a male of our species.