WOAH! That scalated quickly...
dudes, I think that the Female Character just kill herself to 'reset' her own life. Remember that she gave that ability to him, so, its not imposible for her to use that skill (Save & Reset) in herself. Now, this is just a timeline with she died and he alive.
The MC will die soon, because of his own lack of skill, then resets, then when 'that night event' happens again, he might accept her, but she doesn't move towards him... They are 'reseting' themselves and trying to adapt to the pasts events.
But that brings me a question: the history 'diverges' from here? for example, the skill 'resets' her life in a new timeline, and also 'resets' him life (when the MC dies) in another, separate, timeline? or the 'reset' of her is 'waiting' for the 'reset' of him, to maintain ONLY one, concurrent, timeline?
and... when the 'save' event happens? when you sleeps? when you manually triggers it?