This may be slightly long but please bear with me. I'm giving the background for context.
Around April 2016 I agreed to a date with a friend I'd known for a couple of years. It went well and we kissed. Twenty minutes after we kissed he announced he had a girlfriend and had been with her for six months. Naturally, I said I was leaving and as it was a good day I decided to walk back home (about twenty minutes walk) he had to get a taxi back to where he lived but ordered it from my street so walked back with me.
On the way back he started saying he needed to wee and when we got to the bottom of my street he kept asking to come to my house to use the loo. I refused and pointed him in the direction of the nearby park. He kept insisting he came to my house and I kept refusing. He didn't know my exact address just the street name.
As he was waiting for a taxi and I didn't want him to follow me home I waited with him and the end of the street. In that time I made it clear I didn't want to be his friend anymore because that level of deception concerned me and I no longer trusted him. He wasn't happy about it but agreed to delete my number and not contact me again.
I removed him from all social media.
Since then he has made multiple new accounts on Instagram, Facebook, Twitter, Snapchat etc and changed his number three times and messaged me on WhatsApp. The first attempt to contact me again was three days after agreeing not to. His reason was wanting to know if I'd calmed down and seen reason. He tries to contact me every three/four months for about a week each time.
Naturally, that blatant ignoring of my boundaries and my feelings means that whenever I get a new form of communication from him I automatically block that account and it always disappears from that platform after a day or so.
Fast forward this week: I recieved a notification saying he had tried to message me on Instagram. I went on and saw the message request and the message preview showed "hello" as I clicked on the message in order to block the account a video popped up of him really aggressively fucking a woman. I didn't watch the full video but I saw a few seconds due to pure shock. After closing the video I saw his accompanying messages "See what you're missing? Any time you want it let me know" was one of them.
I don't know why but it's really upset and made me feel really uncomfortable/intimidated - AIBU? Please feel free to tell me to grow up and get a grip I think I need it.
Thank you for reading through all of this.