I know we love and hestia and she's my favourite mc too but the whole point of this story is to now show how to let go of the past. When you are too focused on the negative things you lose sight of the beautiful present you have. Just as Kael let go of the heartbreak from Diana and feels at peace now Hestia too needs to realise they have one another now and don't need to care about Diana anymore.
I know we love and hestia and she's my favourite mc too but the whole point of this story is to now show how to let go of the past. When you are too focused on the negative things you lose sight of the beautiful present you have. Just as Kael let go of the heartbreak from Diana and feels at peace now Hestia too needs to realise they have one another now and don't need to care about Diana anymore.