Can I please ask to share your thoughts on this?

Guys can I please ask for your thoughts on this. I went on a few dates with this guy, we always made out alot and had a lot of chemistry and tension. Last night we slept together (we met up super late for a drink and to see the northern lights), while having sex he stopped briefly and said he needed ten mins it was hot and heavy (he legit stopped and had a cigarette and talked for some time) in that time he told me he was demisexual and that he felt a connection to me and that he was very attracted to me we also spoke about other interests and our thoughts, a little while later he kissed me again and we ended up continuing with our sex which was amazing and then today no text nothing. I don't know if it is me and my insecurity and paranoia but I'm wondering now if he was actually into me, if I wasn't pretty or good enough, that maybe that's why he took ten mins mid sex because he sensed my insecurity and confidence issue and maybe if that is why he hasn't texted today (I left his this morning at 7 and nothing all day now11pm- I did leave his to say I had a lot to do today as I can as just nervous and didn't want to impose). I just please ask for you advice as I have quite an overactive and anxious mind. Could I please ask for your thoughts. Have I messed up? Is he not interested in me beyond last night? I know my mind is going into overdrive Im just not very accustomed to this.