Philosophy question-- Jean-Paul Sartre-- existentialist ethics?

What does Sartre mean by saying that we are "condemned to be free"?|||We are "condemned" to freedom, because our ability to make free choices allows us to do all of the horrible things we humans do to each other. Like make war, commit genocide, and build weapons for the sole capability of completely obliterating millions if not billions of people in the span of a few hours of missile launches.|||Freedom comes with responsibility, so it sucks that we have to be responsible for our own choices... there's no one else to blame when things go wrong