boyfriend asks for space every time we argue

I've always been the type of person to want my problems resolved first before I could go through all the other things that I should do. I don't know how to properly respond to my boyfriend everytime he asks for space. Usually he requests for a few days, or a week to sort his thoughts and feelings out, but I always get anxious when we have no communication of any kind since we are in a medium-distance relationship (we see each other every other week). I also am not the type to always demand him for chats, but it really makes me anxious when we don't talk, knowing that we're not okay.

ps: I know that there is no ither woman/cheating involved

How do I respond to him?

update: We were able to talk and apologize to each other. He still asked for some time to himself to reflect but I do understand things from his pov better now. Thank y'all for your advice! I appreciate all of your comments, but I kindly ask you to stop the negative comments about him. He is a great man, but he just always has a hard time expressing himself. I hope we'll be able to work our issues out together. I really love this man and I want us to make it. I'll be keeping your advice in mind if we ever argue again. I appreciate you all!