There comes a warning like a spy — Fading Love

There comes a warning like a spy 1
A shorter breath of Day
A stealing that is not a stealth
And Summers are away-
(F.1560/J.1536)
[1] spy:: one who acts sneakily, her lover. warning:: a sign that she is losing him.
[2] breath:: soft voice, whisper.
[3] stealing:: the love being stolen.
[4] Summers:: the best, passionate time they were together.