BTW, Geoffrey and Diana are now engaged.

https://putanumonit.com/2018/06/20/miller-3-polyamory-mating/

>  'Sexual jealousy is too strong to overcome. And then I met Diana, and she said: “If you want to be with me, you better overcome it”'.

>  'And then I eventually thought of a System 2 utilitarian version of it. I can convince myself that that dude’s getting more pleasure from my girlfriend than I am suffering from knowing that they’re together. So it’s a micro version of Effective Altruism.'

.