The triggers for that scene are:
-Having all five previous visits with Jasper, being on the observe path, and a Jasper romance of 70 or above
So maybe you didn't get quite enough romance?
I'm positive I did everything the same as I had previously when i romanced him, EXCEPT hosting a event in week 1 and offering him an invitation, I believe. So I guess that was the dealbreaker? My goodness!
Jasper is the super challenge mode romance for a reason <3
Fair enough! <3