Try to relax. It's not pushy if you send him a text that says, "Hey, I hope your day is going well. I had fun with you this weekend and would like to see you again." There's nothing pushy or clingy about that. It's quick, cute, and to the point. He probably has an explanation for why he hasn't reached out to you, and he will most likely let you know what that reason is. If not, and he ghosts on you, then you call it a loss and move on. Be thankful you didn't waste too much time on him, and get back into the dating game.
Too many people have different ideas of an appropriate speed for relationship development. I think it's easy to get caught up in the moment of having fun meeting a new person, especially when you connect with them so well right off the bat. There's nothing wrong with that, but if you do feel like things move too quickly, then it's ok to take a step back and say, "Hey, I really enjoy your company, I think you are fantastic, but I need time to myself and to focus on my regular responsibilities". It doesn't have to be worded that way, whatever way feels natural for you, but playing these games of not reaching out to someone you like out of fear of coming across as clingy is asinine to me. If you want to talk to him, talk to him. Don't just wait for him to reach out to you. If you are met with silence, or anything remotely negative, write him off and move forward.
This should be the fun part of dating, when you are getting to know each other and you're excited. Over-analyzing this is going to ruin those feelings for you and put unnecessary pressure on you. Send him a text and go from there!
"Caring is not an advantage."