Hi Ramones,
In the second State Fire you think you are setting the bool to false. What you've actually done is deactivate the Action. Reactivate it by clicking the checkbox next to Set Bool Value.
Also, in the first State get rid of the Next Fame Event and tick Every Frame in Bool Test.
edit: Maybe I've misread your expectations. The way you've set it up is that Get Key Down simply toggles the var to True. It wouldn't automatically reset to False just because the space bar was released.