Do you mind explaining the acronyms you used in the post (ALT, PFP and there might have been more)? You are probably very young, grew up online and assume that everyone understands these acronyms but women who are older and grew up in analog world might not. We may be able to lend support after better understanding what has been happening to you.

Without fully understanding all the details, I can say that my first reaction was that you need to learn online safety, as it seems that you exchanged selfies with a man whom you did not know and you do not even know if he is who he claims he is - he might be a pretender, an imposter... who knows. You really exposed yourself to harm, as it seems that he then broadcast those selfies you had sent him in ways you could not have controlled or foreseen and that hurt you deeply. The same goes for the level of personal disclosure that apparently occurred. All of that endangered and exposed you.

I do not want to defend this character but do want to poi t out that you acted upon hearsay when you told this guy his actions had been wrong after you contacted that woman who wanted to take a legal action against him. You do not know whether what she said was true, and also, as a general rule, it is best to avoid getting embroiled in other people's disputes on partial, unconfirmed information, and even with
access to solid information, only get invovled if you absolutely must.

You are experiencing real and severe mental health synptoms , up to and including suicidal ideation, over something that is not real. You once called this man an account, saying you blocked an account. This is correct: it is an account and you do not know who is behind it. Or, multiple accounts.

Go back to the analog world or, if you have never lived in it, discover it. You are living inside a dangerous illusion and are suffering real harm from unreal entities. Life is too short and too precious to be wasting it like this. If you want to continue leading this 100% digital existence, however, you need to learn special skills to stop exposing and endangering yourself. I believe that nowadays, local police departments' teen outreach units and teen centers in your community may offer free classes thatvteach such skills. Maybe even your public library has offerings. It is worth exploring.