Tolkien writes in the letters of JRRT when asked the question, "What would have happened if Sam had not snapped at Gollum when he'd woken up just before Shelob's Lair?" (He was feeling his wrong-doings at this point.)
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The line in the book had Gollum caressing Frodo, who was asleep, and Tolkien said that if any of the sleepers (Sam and Frodo) had seen him, they might have mistaken him for an old weary hobbit.
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Tolkien's answer was that at mount Doom relising that Frodo couldn't do it he would have taken the ring himself and jumped into the flames.
But when Sam woke up and unfairly called him a sneak it reinforces that voice in his head that says 'nobody likes you, everybody hates you... you must look after yourself'