This is the worst of love, this unmeant mystification — someone smiling and going out without saying where, or a letter arriving, being read in your presence, put away, not explained, or: "No, alas, I can't to-night" on the telephone — that, one person having set up without knowing, the other cannot undo without the where? who? why? that brings them both down a peg. Jealousy is no more than feeling alone against smiling enemies.

The House in Paris (1935)