What is he texts back immediately but doesn't initiate?

This behavior could indicate that the person is interested in maintaining communication with you, but may not be comfortable taking the lead in starting conversations. They may feel more comfortable responding to messages that you send, rather than initiating conversations on their own. It is important to communicate with them and establish boundaries and expectations for communication so that both parties feel comfortable and satisfied. Additionally, it may be worth considering if this is a communication style that is compatible with your own.