Harassment: Accusing BF of cheating

Platform: facebook
Motives: other
Tactics: impersonation, posting false information
Submitter: NS

Description:

I don't know what to do. My friends and family are getting messages that my bf has been cheating on me. One of my friends even got screen shots that show a conversation between him and another girl. His phone number is visible at the top. I don't believe it's him. I think these screen shots are edited photos to make it look like him. Whoever is reaching out to everyone created a fake fb and a fake ig page to get to us. They aren't being threatening at all but it is causing me stress and anxiety. What can I do? Do I go to the police? Can they trace the individual behind these fake accounts and fake text messages?

Examples:

Link: I don't have one