A few months ago I had a temporary guest in my residence. During this time he, without my permission, went through my personal hard disk and copied all of my pictures onto his personal computer. (These are pictures of me, such as ones you take on holidays, and a few more private ones.)
None of these pictures were ever posted online, so the only way he got access to the pictures is because he copied them from my computer.
I only found about what he did recently because I received a message with an attachment from him saying, "I've got these photos of you...."
I told him to delete them, and he said he did.
A few days ago I went to his place and went on his laptop with his permission (as by this point I wasn't trusting him) and There I found lots of other pictures, all from my hard disk that I have never ever shared with anyone, including the pictures that he said he deleted.
What can I do to make sure that all these photos get deleted?
What are the laws about these types of situations?