Am I overthinking?! HELP!

So I posted a few days ago that this guy I had been talking to for a month hadn’t asked me to hangout and I was concerned. Well shortly after he asked me to dinner! So I drove almost an hour to meet him! He’s super cute and funny and just a gentleman. We talked until the restaurant closed and then after dinner he said “I’m not gonna invite you back to my place because I don’t want you to get the wrong idea but if you want we can go to sonic and get a slushee and keep talking!” So we did! and talked till he had to go because he’s a teacher and coach and had to be up early in the morning. Plus he’s helping with admissions because schools starting back so he’s really busy! He told me to text him when I got home safely and I felt so good afterwards.

Fast forward to now. It’s been three days and we’ve still been talking but today he read my message hours ago and didn’t respond! Which is unlike him! He normally can take a while to read my message but the second he reads it he responds.

I know I’m probably overthinking things because this is my first, first date in forever but I really liked him and felt like the date went well! I didn’t think he would extend it and ask me to sonic or keep messaging me after if he wasn’t interested. I feel like he would’ve just said bye after dinner and never talked to me again.

Obviously I’m not gonna be crazy and message him a million times. But I’m a little rusty! I haven’t had a first date in almost 4 years! But am I overthinking things? What should I do? HELP!