Lion man used to be very enthusiastic about me and almost answered my message in seconds. Now he hasn't answered it for a month.

Men are all fresh. He was very enthusiastic about you a few months ago, which means that you two must be strangers, so if you feel fresh at first, he will be very enthusiastic, because he is curious about you, so he can answer all your words in seconds. However, as time goes on, you two get to know each other better, and of course he doesn't have so many common topics for you. I don't have so much to say to you, so it's normal to give you little information now. That's because when two people get to know each other better, the topics will definitely decrease. Especially after he is not interested in you, he doesn't want to reply to your information at all, which is normal.