I agree with Kalimac. Gollum didn't attack Frodo because he knew that if he did, Sam would be right there, ready to do anything he needed to in order to save Frodo. There was nobody else there when he killed Deagol.
Though, after all, it's not like he didn't make an honest effort. He led them right into Shelob's Lair. Though I think that Willie's right, and he and Frodo did understand each other to a certain degree, Gollum's first instinct was to get back his precious. So I think that it was more fear of getting killed himself than real sympathy toward Frodo.
~*~Orual~*~
I think I typed it all right, but if I didn't, forgive me; I sprained my wrist and have a big bulky bandage that impairs my typing.
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"Oh, my god! I care so little, I almost passed out!" --Dr. Cox, "Scrubs"
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