THEY DID IT IN A WAY THAT WORKED NARRATIVELY WISE? In that, like, I love him dearly and I've trusted him basically since day one and even now that he's Evil!Boyd I still love him and want to trust him and they very much played into that. Rather than just "We know you loved him BUT NOW HE'S EVIL HAHA SUCKERS GUESS YOU CAN'T LOVE HIM ANYMORE" sort of thing that I've gotten from other shows.

...I'm still not okay with it. :(