Gomez doesn't say "love you" to Marie either, I don't think even think he calls her that often.
My prediction is that Walt and Jesse patch things up and they both go into hiding. While Walt is hiding out in NH he gets news that Jesse has been killed.
Walt goes back to NM with the M60 to get revenge. He takes the ricin to the desert where he and Jesse first cooked, to commit suicide. Jesse was all he had left.
As he lays there dying from the ricin, Jesse shows up to his surprise. Jesse somehow knew Walt would be there. He rushed as quickly as he could from Alaska (yep) to show that he is alive and well, and his death was just a rumor.
But Jesse is too late, and it is too much for his already guilty conscience. He shoots himself in the heart with the M60 and dies with Walt.
Fin.