Question: In the film *[Triangle](http://en.wikipedia.org/wiki/Triangle_%282009_British_film%29)*, we learn at the very end of the film,

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>  that the Jess we meet in the beginning already went through the loop (maybe even all of them). She remembers what happens on the liner, and she must remember that her main goal was to stop the entire crew from stepping onto the liner.
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When the moment comes when the crew wants to be "rescued" by the liner, why didn't she try to stop them? She hesitates, but doesn't act on it. Why?

Answer: 
Okay Triangle is actually not a time-travel movie even though it seems like one. So she actually is forgetting what happened before due to traumatic event stress and because of where she actually is. It's actually hell. Or at least it is Jessie's personal hell. Most of what we see is her replaying events onboard a ship named Sisyphus which is the king in Greek myth that was sentenced to an afterlife in Hades pushing a boulder up a hill only to watch it roll back down and have to repeat this forever. 

Here is the most logical set of actual events that actually happened. Jess was a shitty mother to her autistic child. She had him in the car and was driving to the boat when a pelican hit the windshield. She pulled over to throw the bird off a cliff but didn't wipe the blood off , probably because she wanted to make the boat. Her kid freaked out and she turned to yell at him and wrecked. This killed her and most likely her kid. Then the taxi driver shows up (grim reaper/Ferryman) and she goes to the boat. The rest that we see is her reliving the events and trying to change the outcome but it's useless because she is already dead and this is her hell. She never realizes this and the audience is never given the full explanation.
I got that the final cicle starts at the end of the film, not that it repeats the first one.
The jess of the ending is the jess that wears the mask and gets shot, takes it off to pretend to be the earlier version, lead the couple to the cabin an slits his throat and say's "sorry, but I need to see my son"
She is the cold 
blooded killer, the one with practice. She also says, when referring to the older version Jess that she "is not who they think"
We never see what happens to that one, and she isn't explained in the loop shown in the movie. (Although the woman she stabs in the stomach is, she dies several times on the deck, this is the only part I can't figure out)

(Edit: There's an explanation for all of them. The blooded killer is the original Jess at the end of her story arc. It's her second time boarding the cruise ship and she gets killed by another Jess that has boarded twice and is watched by a Jess that has only boarded once. The Jess's that have only boarded once are the ones that push each other into the sea while wearing the mask. There are basically seven stages to her cycle.)

Stage 1: Jess goes onto the cruise ship and pushes the masked killer (Stage 3 Jess from a previous boat) into the sea. 

Stage 2: Jess watches another Jess in stage 5 kill the unmasked killer that's in stage 7 while comforting the dying Sally. This Jess in stage 5 is the one she points the gun at in the banquet hall. She boarded the ship on the second boat.

Stage 3: Jess becomes the masked killer and gets pushed into the sea by a new stage 1 Jess that was on the third boat to arrive in the movie.

Stage 4: Jess goes home to save Tommy and gets in an accident and decides to go sailing again.

Stage 5: Jess boards the ship with her full memory which is the fourth boat to arrive in the movie. Stage 2 Jess from the third boat points a gun at her and she kills Stage 7 Jess from the second boat.

Stage 6. Jess hides and let's a new Stage 1 Jess from a fifth boat push Stage 3 Jess from the third boat into the sea.

Stage 7. Jess becomes the unmasked killer and is killed by Stage 5 Jess from the sixth boat to arrive.