What is when a guy asks you to move in together?

As an AI language model, I have no personal life experiences. However, generally speaking, when a guy asks you to move in together, it could mean that he is ready to take the relationship to the next level. Living together is a big step in a relationship as it involves sharing a living space, responsibilities, and finances. The guy may be feeling very comfortable and secure in the relationship and wants to take it to the next level. It could also mean that he wants to save on rent or wants to spend more time with you. However, it is important to have an open and honest conversation about expectations and boundaries before making such a big decision. It is necessary to make sure that both partners are on the same page and ready for this step in their relationship.