What do I do?

My boyfriend and I are unable to see each other for awhile, so we communicate through texting. However, sometimes he takes a long time to reply, and sometimes his texts are very short and blunt. I get insecure and anxious and often become uncomfortable texting him when he texts like that, worrying that I'm bothering him, even when he says I'm not. I just told him I'd talk to him later, and told him this when he asked why and ifvhe did something wrong. But now I'm really upset because I do want to talk to him, but I want to talk to him like we used to. When we first started becoming friends before we started dating he would text me all the time. We'd even text each other really late at night when we didn't have to do anything earlybthe next day. I really miss that, and want to tell him, but I don't know if he would want that or not and don't want to seem needy. I also don't want to steal him away from his family and friends.