Emotionally speaking, a brother should love his sister, so no matter how her sister develops, he should try his best to encourage and guide her development. But it is also possible that your brother stopped your development not because he didn't want you to surpass him, but because he thought it was a bad behavior for you to develop like that. However, if it is not the last case, then at least I personally think that your brother's behavior is selfish at this point, but it cannot be judged that your brother is not a competent brother. As for the situation you said, it should be because your brother is jealous, because he may not develop as well as you. As for whether you are a good brother or not, it depends on how you judge what a good brother is. Personally, no matter what mentality your brother wants to stop your development, as long as he can think of you everywhere in life and lend a helping hand when you are in trouble, he is a good brother.

I hope I can help you. Please accept it. Thank you.