She didn't care though. I don't get the speculations in here that she might not have cared and maybe only did it for attention. The clues are right in the post.
He liked her and she didn't like him.
He started to go to therapy and she started to distance herself from him and "move on". Move on as in leave him as a friend.
She then talking about she don't know if it's selfish or not, meaning she know what she did was selfish but don't want to admit to herself she was wrong.
Then said she didn't have all the details and don't know when he did it, but knows he kills himself. The guy was a literal distant memory to her until she finally remembered about him.
Stop acting like idiots. She legitimately made that post to get a confirmation from simps telling her it's not her fault and that it's okay and so on and so forth.
I will admit that if I feel like I did something bad, which I never do, I would probably try looking for people to tell me what I did wasn't wrong to clear my conscience and move on with my life. Just like her doing it and knowing that even though it was technically because of her and it was her fault that the dude killed himself, she will continue living and thinking "Well it was because he was unstable. Not me. Now to find a new chad to fuck."