Why did you feel sad for Taiga? I didn't. The only reason his fated partner was bitten by another was because he tried to gang-rape him and at that point he was speaking rationally enough that he could have resisted the rut/heat if he had wanted to. He just a little prick that didn't care, he even said that when Yuka came back to help Kaoru that Yuka was inviting them to gang-rape him and they needed to rape him to teach him his place.
I dislike Taiga and if I hadn't felt so bad for Rin, I would have wanted him to spend the rest of his life alone. He never even apologized for his behavior.
Cute. I liked them not ending with their fated partners. I mean... every omegaverse manga I've read follows the path of the "fated", so it's kind of cute and realistic for there to be a story in which love just because of love wins, and not because "they were meant to be together". I was sad for Taiga at first, knowing your fated partner is already paired with another alpha, but you see... love can be bloom unexpectedly