With Melkor's case, he likely loved possessing the Silmarils, but hated the pain they caused him.
With Gollum, I'd say similar to Melkor, but more because the Ring forced him to love it, and the 'halfling' side of him hated what it had done to him.
I'm not sure what to think about Ungoliant and the light, however, as it isn't really expanded on like Melkor and Gollum.
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