What would you do if your partner went days without contacting you after an argument?

We got into an argument, it wasn’t over anything crazy, it was actually dumb. The argument was heated for no reason and only lasted 5 mins as we went our separate ways. However, I was the last to text the day of the argument, and he hasn’t texted me. This was 3 days ago. We’ve been together for 4 years and it bothers me that he can go that long without reaching out to me knowing I was the last to message. I won’t be putting my ego aside and texting first because this has happened before. I think he’s too comfortable with me reaching out after he ignores me for days. Any advice appreciated x