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Most of us already knew but in chapter 44 it's confirmed that Tehir had a crush on Jin. Kimoto knew this from the beginning and admitted that it was the real reason he hated Jin so much.
It's also revealed that Tehir started moving around, studying and trying to better himself for a while after they found Jin. It upset Kimoto because giving Tehir the motivation to better himself was something he could never do.
I had been wondering for a while why we hadn't seen Jin and Tehir interact more since their relationship is so important plot wise. But now I'm thinking that it was Tehir intentionally avoiding Jin. Jin was not only his crush, but the only person he perceived as being his equal. He wants to show Jin a better side of himself, and doesn't want Jin to see how "pathetic" he's become. But, Jin had completely lost his memories and that must've been incredibly frustrating to Tehir, who wanted to prove himself.
The past few chapters have added so much to Tehir's character, and I'm very interested to see where the weird love triangle is going.