Black sashes - Falbeson's betrayal

In this Thronebreaker battle we meet Falberson, a former captain in the Lyrian army who has defected to Nilfgaard or was he forced? After the battle you have choice to either believe him and spare his life, where he invites you to a banquest at his house, or kill him there and then. What will you choose?
I chose to spare him. Let's see what the outcome will be.......