vigilasteis
-you watched
The word vigilasteis is the preterite form of vigilar in the second person plural.
See the full vigilar conjugation

vigilar

¿Así que comprasteis uno de mis atuendos y vigilasteis mi apartamento todos los días hasta que me lo puse?
So you guys bought one of my outfits and then staked out my apartment every day until I wore it?
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