I hope we get flashbacks to his past when he first came across the One Ring and was forced out of Hobbit society during his downward spiral:
"No one ever found out what had become of Deagol; he was murdered far from home, and his body was cunningly hidden. But Smeagol returned alone; and he found that none of his family could see him, when he was wearing the ring. He was very pleased with his discovery and he concealed it; and he used it to find out secrets, and he put his knowledge to crooked and malicious uses. He became sharp-eyed and keen-eared for all that was hurtful. The ring had given him power according to his stature. It is not to be wondered at that he became very unpopular and was shunned (when visible) by all his relations. They kicked him, and he bit their feet. He took to thieving, and going about muttering to himself, and gurgling in his throat. So they called him Gollum, and cursed him, and told him to go far away; and his grandmother, desiring peace, expelled him from the family and turned him out of her hole." -