This is why Buffy is incredible.
It commentates itself. It’s a very post-modern techqniue, but normally the line would end with “As long as nothing bad happens.” and BAM there’s Spike. The bad. Buffy utilises the cliche lines and is self aware of the cheesiness, making it into a joke that both the characters and the audience share. This way, such lines, that can be unavoidable when dealing with a Big Bad, are much less tacky.
It’s best seen in ‘The Zeppo’ (S3 E13), the whole episode is from Xander’s point of view. Showing the stereotypical scenes of the show from an outside perspective without the insider detail we usually get - Every scene we get a glimpse into is a usual, stereotypical Buffy scene, which the writers are self aware of. It’s really obvious in the Buffy and Angel argument, we just slip right into this really intense argument about death and love and swelling music and it’s interrupted by Xander. It draws attention on the usual passionate, Romeo and Juliet arguments the two seem to have every episode. It is aware of that, it uses that to refresh it comically.
It’s absolutely brilliant. Keep a look out for it, it’s everywhere.