What should I do about her?!?

I don’t know if I trust my friend. I had an ex last year and she wanted to “be friends” with him after we broke up. She said he was cute and saw him on tinder. I told her not to swipe but she might’ve. I have a new boyfriend and everytime we hangout she wants a picture of him. She has no idea what he looks like or never met him or anything because he lives in my home city.She wants to know when I FaceTime him. I leave our house to call him sometimes. She knows this. Once she was waiting on me to get back and had her door open. I left and she was there and 20 minutes I ran onto her on campus. I know she probably was looking for me. Her parents asked for a picture too but once. All the pictures he has sent me has been of him working out and shirtless or of family. They aren’t proper pictures to show others. I cannot understand why someone would care this much. Her mom asked once and that was it. She is sort of competitive

 so I hope she is not starting to doubt I have one. I said I would post a pic of him this summer so everyone could see him but it’s soo annoying and me and my friend are not besties. Me and him are a little over a month and just my family has seen him. She invited me to her house for the weekend and her mom never asked again. When me and her were alone she brung it up again and asked if he sent a selfie. Also she asked on the drive there. It’s so weird! How do I get her off my back. I feel like she’ll do something behind my back and try to find him.