Is it my ex behind a fake account?

I had an account add me on Snapchat. It looked like the name of someone I used to work with while dating my abusive ex. it had the same first name and last initial, so I added it, thinking it was my old coworker. But when I added it, the account started to say that they “wanted me” and asked if they could “have me”. I thought it was really weird so I reached out to my coworker’s Facebook before responding and he said it definitely wasn’t him. I looked at the Snapchat account more and it’s a fake account. I asked who it was and it just kept getting weirder. they said something about how they know I “want them” and randomly threw in “you could steal her man right?” (Which is really weird because I’m single as fuckkkk. I don’t talk to anybody at all let alone romantically. I have 2 kids and just left abuse and got diagnosed with PTSD from it, I can’t handle another relationship right now). Then randomly asked if I was still with my ex. I figured maybee they knew me from work, because people knew I had a boyfriend but I never named him, I was really shy when I worked there, and that was almost 5 years ago. So then I thought maybe Facebook? But my ex always used a nickname on Facebook to hide away from his “crazy ex’s” (🤦🏼‍♀️). So it kind of clicked that it’s my ex… right? I have a restraining order against him. What should/can I do?

*Response to comment: I only added it because it really looked like my coworker’s name.