Free Will in Slaughterhouse Five

I'm not convinced that we "Free will allow us to make the choice whether or not to tell people others about certain events that have taken place in our lives." Honestly, I think that there are many other factors in choosing to tell someone something (like in Slaughterhouse 5) that are beyond our control. Have you ever had the experience where you want to tell someone you trust something but you can't because you're afraid to hurt them? Or that they'll look at you in a different light? Consider Billy Pilgrim -- telling his wife about the war perhaps was not simply a matter of trust but also, that he didn't want to bring up the war, that he didn't think that it was the right time or even that he just simply couldn't bring himself to do it. Just because you have the choice to do something does not mean that there aren't other things that will determine HOW you choose to act on it.