Why is my ex stalking me?

My ex and I are 22 years apart. Dated for 2yrs. My stalker for about 4yrs.

Backstory: Heavy drug user. Needles. I finally was able to get away from him when he pressured me into trying injections with him. I didn’t feel safe around him. I tried multiple drugs because of him, he would overdose me on drugs I’ve never had before. It was after we broke up that I realized he had been overdosing me, when I did it with other people it felt a lot different. Less intense, I was more functional. He would get me to do things with other people when high. Thankfully, I had a strong mind and can control my decisions. But I’ve done some things I regret because of him. Some think that he tried to pimp me out. Super toxic 2yr relationship.

I keep getting disturbing messages from multiple fake accounts. All variations of “Ashley Jones, Julie Jones, Ashley Hones,” for quite awhile now. I find no point in blocking as a new fake profile will pop up. I would need to either delete/abandon the account. And just make a new one with a fake name. I’ve resorted to just not opening the messages.
He would usually send me the same repeating messages &pictures. Naked pics of both girls &guys he got from online. Some are real. And he would actually send me videos of him getting BJ’s. And I know it’s him because he wears the same light blue boxers,& I recognize his hand.
I thought deleting the whole convo would move it to message requests, he mustve saw that I opened it& the last two pics is what he said to me. But I’m not falling for that.
My question is…why? I haven’t done anything to him.
couple weeks ago, he messaged me for 12 hours. 1am-1pm.
I just would like someone to shed some knowledge on why a person would act like that.
couple examples of previous messages
couple examples of previous messages
Why is my ex stalking me?
Why is my ex stalking me?
Why is my ex stalking me?
This is the most recent message, as well as the one down below.
Why is my ex stalking me?
Why is my ex stalking me?
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