Because he's playing the game.
Because he is willing to take huge risks.
Because he may have figured Jon would not survive.
Because he is obsessed with Sansa.
Because to sit the Iron Throne he needs more than the Vale, he needs the North.
Because he is arrogant and starting to show some hubris.
Because he believes he is always one or two steps ahead in the game.
Because even if Jon survives he believes he can still manipulate Sansa.
It's not that hard.
He is one of the best characters in this whole story. Hands down. This is what makes GOT great. And all I am saying is that LF is, IMO, at the end of his run. Sansa can't allow the Knights of the Vale to leave and if she has to expose LF to make that happen she will. But he is not in control anymore.
Because he is willing to take huge risks.
Because he may have figured Jon would not survive.
Because he is obsessed with Sansa.
Because to sit the Iron Throne he needs more than the Vale, he needs the North.
Because he is arrogant and starting to show some hubris.
Because he believes he is always one or two steps ahead in the game.
Because even if Jon survives he believes he can still manipulate Sansa.
It's not that hard.
He is one of the best characters in this whole story. Hands down. This is what makes GOT great. And all I am saying is that LF is, IMO, at the end of his run. Sansa can't allow the Knights of the Vale to leave and if she has to expose LF to make that happen she will. But he is not in control anymore.