Why would a guy do this?

Recently been seeing a guy for over a month. We would spend almost every weekend together. He would let me stay the night over his place if I wanted to. We would kiss and talk a lot to each other. We got into a little disagreement last Sunday and I thought we resolved the issue, but then all of a sudden the communication changed he went 2 days without texting me. He eventually texted me and I went a day without texting him. And I texted him to see how he was doing and he texted me back right away. And then he just ghosted me. It’s going on day 3 and haven’t heard from him.
Why would a guy do this?
Post Opinion