Newly dating

I think I’m overthinking things so need some advice.
About a month ago I started talking to this guy, he is respectful, caring just a really good guy. We had our third date round his house at the weekend and he cooked me dinner. When I arrived he was a bit flustered as he’d been running late. He didn’t seem as comfortable as usual around me. It was a nice evening, we didn’t and haven’t had sex yet. We chilled on the sofa for a bit but the heat was insane and he was noticeably bothered about how sweaty he was. When I left I felt a bit put out because he wasn’t his usual comfortable self around me. I asked him and he said he was hot and flustered and was worried how he looked. Since then it’s been playing on my mind and I asked him if everything was ok and told him my thought and asked him if he wanted us to take a step back. He told me to stop being silly. He text me good morning and good night everyday and still does and is just really nice. But I can’t help notice that since then he is slower to respond to me and I’m just overthinking everything. I know how rediculous it sounds, I just can’t tell if I’m overthinking things or if he is slowly going to back off but doesn’t want to say because I know he would hate to upset me .