What does it mean for a boy to tell you that it was nice talking to you?

It means that you have a good chat and have a common language meaning. If two people are not on the same channel, it is like casting pearls before swine. Naturally, there is no common language, so it is impossible to talk happily.

At the same time, I think he is implying that he likes to chat with you. At the same time, it also shows that this boy wants to chat with you, because everyone wants to chat with someone who can make him happy.

However, many people just need to know that they are happy, and they can talk about it. There is no need to tell each other how they feel. Telling each other is to resonate with each other, attract each other's attention, and make them feel good about themselves, so as to further deepen their understanding.