Give him space?

How do you know if a guy is really pulling away/going cold or if it is your anxiety? I asked him once and he gave me a confusing answer but let it go. Recent days the communication has dwindled, doesn’t ask me about my day or anything really. Just nonsense texts, no calls in a week. I want to act normal and not keep asking him if anything is up if it’s just me being overly anxious. My normal thing would be to ask him a question or something but I feel like I should hold back and see if he reaches out to me when he’s ready. I understand he’s working and can’t be texting me but sitting in this discomfort wondering where I stand is killing me. But sending a text and getting a one word answer or being left on read would hurt more I think. How do I sit back and just let him go?