The divergent series.

I just finished Allegiant, from the Divergent series and I need to vent.
SPOILER ALERT
The first book was really good, thes econd ended on a plot twist, but the third...the third.

Okay, now for those of you who do not care about or have read the book....
I can not believe the ending! They killed off Tris. You can't just kill off the main charterer.
That breaks the unspoken agreement between author and reader. Here is the agreement:
1) You explain all dilemmas and secrets in full unless there is another book, in which you must explain it there.
2) If I get connected to your charterer then I am entitled to a back-story of a sort.
3) You are not allowed to kill off the main charchter without a proper ending.
4) If the main charterer is killed off YOU DO NOT CONTINUE ON THE STORY FOR ANOTHER TWENTY PAGES. THIS IS UNACCEPTABLE.
5) I am reading this book, you have to space out exciting events and notshovealltheplottwiststogtherlikeso.
6) I am entitled to an at least decent ending. Do not get lazy by the end. Do not.
Alligiant broke too many of these rules to be acceptable.
Not nice, Divergent series. Not nice.