Didn't download the video but did read the lyrics. I somehow can't picture "our" Vilja as a love-'em-and-leave-'em sort.
No, "our" Vilja is true as gold. It's just that Franz Léhar, who composed this operette in 1905, didn't know her as well as we do. And his Vilja is, better translated from German, no witch but a spirit of the woods - let's say Mother Nature in a more seductive form - who cannot be owned by someone although he is in love with her. It's just - like "our" Vilja - a northern legend. And "our" Vilja really is a legend by now. Just have a look at the videos, although the music may be a bit out of time. (My kids hate the so called classic music. For my term I like every music that is touching)