I'm going to take a guess that the boyfriend actually just fell off once the whole island, as it were, become a united, spherical Eye of God once again.
That, though, doesn't really explain why neither Rune Venus nor any of the rest of the cast EVER comment on the guy. Or even look at all sad about his loss.My personal theory is this: Not long after Chabil is seen for the last time, Afura Mann comes flying in to the rescue, even though she was with the group before. I think that she carried Chabil to safety, and was just then returning to do the same for Rune Venus and Mr. Fujisawa. So, knowing that Chabil was safe, Rune Venus was free to return to the rigors of palace life with no further regrets.Of course, there's no evidence to prove this, but I think it's a nice, positive, elegant solution to what is a rather deplorable dangling plot-thread.
Don't knock the Jinnai blood, my friend. It keeps you healthy and strong, with a full head of thick, combable hair.