I got in touch with my first love, but I just want to be friends. I have explained it, but why didn't I reply to the message? I turned him down at first.

What is your message about? If it's just a general joke or holiday greeting, it doesn't matter whether he comes back or not. If your information is ambiguous, then he should not reply to you to avoid unnecessary misunderstanding. I think it's you who can't let go now. If you are really just an ordinary friend, then this is just a holiday greeting. First love is wonderful, but since it's over and you have your own lives, it's better not to interfere with each other.