Second point: The Palestinian stance on Jerusalem is simple....go to pre 67 borders and each side gets a piece of the pie.
Third subject: This one is kind of connected to the first, Abbas was willing to comprise by allowing a small token of Palestinians in. Israel again refused the comprise because in a way by not allowing the Palestinians to return they will admit that they never belonged their.
All of these subjects got sabotaged by Israel because end of the day Israel has nothing to gain by achieving peace. Israel can do everything it wants right now, a sovereign Palestinian state would stop all of that.