What should I do if he’s not responding to my texts?

My boyfriend and I talked on the phone the other night. I felt like it was a great conversation after a breakup. It didn’t feel like there was any anger and it felt like closure. However, recently he’s been real cold. Tonight I asked him when a good time to get my things would be. He responds with “I’m working all weekend”. I asked him if there was any free time and he’s not replying. I need those things and he’s not being very cooperative. Why is he doing this? The other night, we had a mature, pleasant conversation. Now, he’s acting cold again. Why do you think he’s doing this and what should I do?
What should I do if he’s not responding to my texts?
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