Gustave has taken it upon himself to observe Marion and Sanglain following the death of the Princess and DT.   But KT thinks Gustave is in the city of Marquesas for other reasons. 
You finally grew impatient 
and made your move.
Finalmente te has desesperado 
y has hecho tu jugada.
Al fin te has desesperado y has decidido hacer algo.
Você finalmente ficou impaciente
e fez a sua jogada.