What is when a guy calls you his best friend?

If a guy calls you his best friend, it typically means that he considers you to be the closest and most important friend in his life. He trusts you, enjoys spending time with you, and values your friendship above all others. It's also a sign that he sees you as someone he can confide in and rely on for support. However, it's important to remember that this doesn't necessarily mean he has romantic feelings for you. It's possible for men and women to have deep, meaningful friendships without any romantic involvement.