More rescued words

There are no dates on the actual writings I have rescued from my old email folders - only the dates of storage. I know this one is older than July 2008 (when it was stashed away) because I know which event in my life it describes.

This one was for you, K!

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Love is a disease, they say, and it’s true.
The symptoms are the same.
The faster heart, the sweating palms
The lack of concentration
Could all be flu.
Do I know if I am ill? Or in Love’s sight??
Do past romances tell?
No use depending on old loves
For a clue as my last was
A parasite.

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Incidentally - six years on and he's still a keeper!