My blind date (male) who has been together for 6 days is in a different place. I went home by train today and chatted with him. I started to pay it back, and then I stopped paying it back.

The length of time to reply to the message doesn't mean anything. You can directly ask him why he didn't reply to the message. Don't doubt. If he is all right, he will answer you generously. If he is hiding something, he will definitely lie, but if he lies, he must cover it up with more lies. You can say goodbye to him once you find out that he is lying to you.