<human>: I lived with Robert for 4 months last year in a 2 bedroom apartment. We did not know each other before. We met through our university housing group.

I just got a message from Chris, a guy I don't know, who is friends on Facebook with Robert. The relevant parts of the message say: 

"Robert told me that he heard a sound from your room, and went to investigate. He saw the computer was on, and he "found some pictures on it" which were meant for your boyfriend. He took snapshots of them with his phone. He said that he took multiple photos, not just one. [...] I'm as sure as I can be, as he told me of this one night out. I personally have not seen these photos, but from my personal history with him, I would not put it past him. It would not be out of his nature to do such a thing. [...] But yes, he said that he saw nude photos of you on your computer (iMessage to be exact), and he took photos of them with his phone. He said he has a few, so I'm guessing he scrolled around as well. "

I am 99.9% sure that this is the truth. Yes, I sent nudes to my bf over iMessage, and yes, I left my laptop at home sometimes. 

He is also cat-sitting my cat for the next 2 weeks, so I will have to go see him when I pick up my cat.

So.. what do I do now? I want my pictures to be deleted from his phone/computer. And I want him to get in trouble for this. 
As I see it, my options are 

1. Go to the police, but i'm not sure what they would do in this situation.

2. Go to his house with some of my more intimidating guy friends, and tell him I know he has the pictures, and request that he deletes them in front of me.

I know the second option is probably not the best idea, but I'm also 99.9% sure that he would not react violently or anything.

Give me the gist of the text in a nutshell
<bot>: old roommate went through my laptop, and took pictures of my nudes with his cell-phone. I will see him in 2 weeks to pick up my cat from his house. What do I do?