
(Spoiler)
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It ends at about the same time it did the first time around, with the storm and stuff. Vincent is the one to look for Oriana this time around bc he remembers she's scared of storms. Then, the same thing happens, with him getting in the room and fainting (dying) after Oriana. It's kind of a coincidence at the moment that he's the one getting sent back this time around, but we learn later they always take turns ( Oriana then Vincent then etc etc) so it's more something to do with fate.
As for the "why," it's the same thing that's being doing this for forever, so it happens again bc they never really discovered or solved anything in this timeline. Idk how indepth an explanation you'd like on it tho

(Spoiler?? I guess??)
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They do get a happy ending. Next time is the charm, in fact
can smo give me any spoilers like when does this timeline end and why