Why he doesn’t want to show emotions?

My older brother really liked one girl. She liked him too. They kissed few times and went out. I thought they are already together. But she turned him down. It really hurt him. I always tell him that he can talk to me if he needs to. But he always says it is fine. But i can see it is not. Obviously. On weekends he only drinks with friends. He is lot meaner and his smile is different. I think he is handsome and i know girls that would like to get to know him. But he just doesn't care anymore. He says he is done. I also think he is too hard on himself, he blames himself for that and that he screwed up.

Why he doesn’t want to show emotions?
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