My wife remembers only the first stanza:

C'e' un fiume amaro dentro me
Il sangue della mia ferita
Ma ancora di piu' e' amaro il bacio
Che sulla bocca mia mi ferisce ancor

Translation:
There's a bitter river inside me
The blood of my wound
But more bitter is the kiss
that still is wounding my lips

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Probably it was sung by a singer named Iva Zanicchi. We can't remember what's this lyric about.
Ciao