As expected, it's over.
And we will never know if the person they are meeting is the sister's boyfriend or a woman.
I still have a hunch it's a woman, because he wants Shima to be present. If it was the sis' fiance, he wouldn't care.
And that the sister would have a b/f, a fiance or a husband isn't really relevant to their slice of life.
That he'd maybe get together again with a woman, is.