Sentence:  Falling in love, I said. Falling into it, we all did then, one way or another. How could he have made such light of it? Sneered even. As if it was trivial for us, a <WSD>frill</WSD>, a whim. 
Meaning of the word marked with <WSD> tags:  Something extraneous or not essential; something purely for show or effect; a luxury.