We just have different perspectives. No harm. No foul. It is just a t.v. show after all.
For me I saw that Gabe could fall for Cat during S1. The episode where he visited the her mother's grave and she saw him there. He told Cat all the things her mother had told him about Cat--the type of music she liked, that sort of thing. So in a sense he knows her. He knows things about her that he would have learned had they dated. That scene at the cemetery was rather sweet. It showed that he was in touch with his humanity. With everything Cat's mother had told him about Cat, he had been endeared with Cat for years then he eventually met her.
It is only because he was so desperate to find a way to cure his beast DNA that he did not act on his feelings for her. And the way he handled Cat when he used her as bait to lure Vincent was conflicted. He just felt he had no choice but to kill Vincent.
I didn't see Gabe as evil but just driven to control his beast side. He wanted a normal life and he finally has it. Now he can express what he feels about Cat to her without any fear. Hope that helps.
I initially did not like the abrupt change in story this season but this episode changed my mind. Agree with the review. Expanding the beast mythology was a great story shift.
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