does my boyfriend need space?

idk whats wrong. i keep trying to talk to my bf but our conversations are short and dry. im afraid that im losing him, because this is what happened the last time we broke up too... we did this thing where we asked each other questions and i asked “what is one thing i should know about you in this relationship “ and he said that i should know that sometimes he dosent want to talk. like he’ll want to listen to music and be alone. and this whole time ive just been preparing myself to give him his space when he needs it—i just dont know when. like he wont tell me when he wants to talk or when he dosent want to, or when he needs some space. i feel so closed off. i know about his past and his whereabouts, but i cant get into his head. i never know what hes thinking about. he dosent open up to me or tell me whats on his mind. and it kind of worries me. we havent talked as long as id like for the past 4 days and im scared that im losing him. just like last time.