HELP!!Has anyone else experienced this w/ their partner?!

My boyfriend has always been turned on by me. Just by kissing he gets hard lol but today it was different so I turned him on make so moves then we had sex but I like to do two rounds the I’ve had enough he’s the one type of round but if I’m showing him with my body that I want a second round he’ll go for it. Today, I kissed him and did the ass up and head & back towards the bed style. As he was putting it in it was hard but then like 5 seconds later boooom

I was feeling floppy and it was nothing. He wasn’t hard his thing was just normal. Is he not turned on by me anymore? Is he not interested? That’s usually his favorite but after he knew I knew he tried kissing to bring it back up but I didn’t want to anymore. So we just napped.