[@Always]Treter (Pris?) is immpossible by th end of Allegiant.
For 2 reasons

1) [hider=spoiler]
[hider=I'm serious, be here spoilers.]
Tris dies at the end [/hider][/hider]

2)[hider=also spoilers]
[hider=Second chance]
Peter chooses to erase his memory[/hider][/hider]

And just a word of warning, Allegiant isn't very good. It just kind of throws the plot of the first two books out the window. Read at your own risk.