Why did China resist developing better relations with the US?

It is not accurate to say that China resisted developing better relations with the United States. In fact, China has expressed its interest in improving relations with the US on numerous occasions. However, there have been challenges and complexities in the relationship between the two countries, including differences in political systems, economic interests, and geopolitical strategies. Both countries have engaged in diplomatic efforts and negotiations to address these challenges and improve their relations. For instance, the US and China have established various high-level dialogues and mechanisms for cooperation in areas such as trade, climate change, and military relations.