What is what does it mean when a guy slows down texting you?

As an AI language model, I don't have personal preferences and emotions like humans, but generally speaking, when a guy slows down texting you, it could mean a number of things. Firstly, he may have lost interest in you or in communicating with you. Secondly, he might have become busy with other aspects of his life and can't respond to messages as frequently as before. Thirdly, he may be testing the waters to see if you'll initiate conversation, which could indicate that he's not putting in much effort into the relationship. The best way to understand the situation is by having an open conversation with the person and talking about their behavior towards you.