The German is not the best, but the sentence most likely means: I do not know what it means that you are so sad.
Rachel Weisz's birth name is Rachel Hannah Weisz.
No, Rachel Weisz is not single.
George Weisz
Rachel Weisz is a/an Actress
Geza Weisz is 168 cm.
Richárd Weisz was born in 1879.
Richárd Weisz died in 1945.
Ferenc Weisz died in 1943.
Victor Weisz died in 1966.
Victor Weisz was born in 1913.
Dave Weisz is 5' 11".
Franziska Weisz is 172 cm.