Ignoring me? Maybe?

So we’ve been talking for a few days now on Snapchat. Last nite he said : “we should hang out sometime!” Then I relied : “I’m down!” He opened it and didn’t reply back. And today I didn’t want to be pushy so I never sent or said anything to him, I was waiting for him to do something first, but he never did. I get if he’s busy, but if he’s not what does this mean? Am I overthinking this? Just throw some ideas pls!