Regardless of the new behaviour, if he's eating and drinking more and losing weight, I would take him to the vet to have that checked out and mention the behaviour change at the same time. If the vet says he's ok, then just enjoy the cuddles

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Owned by Ratty girls Hera, Athena, Boomer and Kitty the Cat
RIP Apollo and Starbuck, together again at the Rainbow Bridge. Till we meet again.