He has changed. Some of the changes are for the better, some of them are most definitely NOT for the better. In trying to give Beckett her room and not push her away, he made himself her doormat. Period. That is a hard pill to swallow for the fans who loved Castle, just as he was, for the first four years.
Another example of a change in Castle that has nothing to do with Beckett, is the time Castle was in his study, alone, clearly trying to decide what to do about the haunted DVD. The clock read 3 am which tells us that he was up worrying and debating about what to do. He picks up the phone and calls Wes Craven to ask him about a story in which a haunted DVD might cause the deaths of the two heroes in a story he was not really writing. He clearly believed that he was in trouble and needed help. Castle from 2 seasons ago would not have had that issue. Even season 4 Castle would not have been that foolish.
By way of example, Castle did not believe in the Mummyâ€™s curse or in UFOâ€™s prior to this season. Now he apparently believes in Bigfoot and Haunted DVDs. His books are no longer â€œbest sellersâ€ but relegated to the clearance table. He doesnâ€™t spend time researching and writing, but playing with remote control toys. He makes asinine remarks that annoy everyone around him, most notably Espo, who used to refer to him as â€œour boyâ€ or â€œbroâ€. Now (last 3 episodes) all Castle gets from Espo are harsh looks and at least one critical remark about the names of the characters in his novels.
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