What is if a guy keeps your picture?

As an AI language model, I do not have personal beliefs or feelings, but here is some general information:

If a guy keeps your picture, it could mean many things depending on the context and the nature of your relationship with him. It could be a sign that he is interested in you romantically or simply wants to remember you as a friend. It could also suggest that he values your presence in his life and likes to keep a visual reminder of you, especially if you live far apart or do not see each other often. However, it's important to keep in mind that keeping someone's picture without their consent could be considered an invasion of privacy or even stalking, so it's always best to respect each other's boundaries and ask for permission before taking or keeping photos of each other.