We had sex on the first date is he still interested? Should I ask him what's wrong or just move on?

Anonymous
Hello, I met this guy on a dating app. When we started talking he was very nice and very interested. From day 1 were talking all the time through messages. Two days later he asked me if he can call me. First time we spoke for over 4 and I could feel we were very compatible. He seemed nice and sweet compared to other guys I spoke to.

Then he asked me if he can call me every night and I agreed. We used to speak for hours. He kept on mentioning in our conversation that he likes me, I am funny and nice. After 3 days of talking he asked me why am I on a dating app. I explain and his reply was that he cannot understand because I am very nice, funny and pretty.
We continued talking on the phone for more than a week and I felt very comfortable and I could feel he was too.

He asked to go on a date, to which I agreed. As I work long ours it was not possible to meet up outside. He suggested to come to my place for a movie. I have never done that before but In the end I agreed. The date went well we spoke for a long time, and one thing let to another.

We had sex on the first date. This being my first time ever having sex on a first date. He was nice and sweet after, behaving like a boyfriend and he stayed over. He hugged me the whole night and didn't let me out of his arms not even once.

When he left to go home. I just told him to tell me if he reached safety which he did. But after that message it was strange. He told me he is ill. He didn't reply to my messages anymore. He is very cold and doesn't seem interested at all.

I messaged him very little making sure he is okay but when I called him he didn't answer and made excuses. I though of giving him space as he metioned all the time he is ill.

I am not the clingy type. I did not ask him what we are either. I don't know if I should ask him what's wrong but his way of replying hurts me. Should I move on?
We had sex on the first date is he still interested? Should I ask him what's wrong or just move on?
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