So 'she' will be existing in the future.
It's a tragic arc for Carmine though she did gained a promise for the last bit of time that Happiness Mc has so a bittersweet one. You aren't planning to make Happiness Mc break a promise again would you?
Still I'm surprised... Happiness Mc still had the will of his just to make 'her' exist. I really like how that part of him didn't change.