Well, of course we learn that Gollum is not wholly evil. But i wouldn't say that he was trying to let the ring go. That would have been impossible for him. He always wanted to bring Frodo and Sam to Shelob, this was his main plan. And than he would all show them, that's what he's thinking.
He even killed Deagol just by the desire for it, which is mostly the influence of the ring, but to become overwhelmed by the desire for it (and I mean as fast as Smeagol was overwhelmed) shows that someone he was already evil in his mind, or at least partly evil.
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Behold the Great Evil!
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