am I exaggerating?

I have this ex that is literally the devil himself. We dated for 3 years, that was 3 years ago. I thought I would be okay doing my healing since he was finally gone from my life but year after year he appears and I have him blocked EVERYWHERE. On May from this year he found me on Facebook (don't know how) and out of curiosity I accepted which we ended up talking and he mentioned how he went to prison and that he's in a toxic relationship, which to be honest I wasn't either happy or sad to hear this. After that I blocked him again. Yesterday after I had an appointment I noticed I had 10 notifications on instagram and when I checked the guy had created a new account and followed and liked my posts with stories as well.

This is where I ask if im exaggerating, I feel paranoid. My friend told me im being stalked. I really haven't been scared of a person like I am with this guy. I know it may sound stupid liken following and creating new accounts but I don't like it, I feel uneasy.