Why is he being like this?

We had our first fight about a week ago. I told him we weren't communicating like we used to. He got pissed and was like this is the exact reason me and my ex broke up. Well yesterday I text him before work about 3am. I didn't expect him to be awake and text back. No biggie. But I didn't hear from him the rest of the day. At all. Around 4pm he post to his Snapchat story. But still nothing to me. At about 9pn I text him, well goodnight. And he immediately text back and said sorry I've been busy. Really? All day, I'm not an idiot. Why is he being like this? I'm not clingy. But is this something I should be worried about?
Why is he being like this?
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