The girl said humorously that I accepted you, and the boy sent a full stop. What do you mean boys like it or something?

First of all, you said I accepted you. You two must have said it casually when you were joking. Then he will hesitate for a while, and he will wonder what you mean. One possibility is that he didn't understand what you said and thought you were joking. He wanted to subconsciously ask what it meant.

What's more, he always has you in his heart, but he just doesn't know how to express it. Every time I chat with you, he deliberately approaches in the direction he wants, ready to set you up. When you say this sentence, he has been waiting for so long that he can't believe it for a while, so he subconsciously asks you again.

Finally, he may not be interested in you, and he didn't care when you said it. He just didn't understand what it meant. Just asking, don't take it too seriously.

Besides, whatever he means, since you have the will, it's up to you. If you like him, just say so, and if you don't like him, forget it. Why bother?