I think I finally realized what the story will be
So basically Jason wants to live a quiet life but lucia keeps pushing him deeper and deeper into crime. Rockstar described the game as a bonny and clyde story. What if the ending is about Lucia pushing him to do some kind of superheist and if jason says yes they would die together as lovers like bonny and clyde, or jason says no, which causes them to break up losing their love but saving both their lives