Is AUTHOR wrong in the post ? POST : So in freshman year in my high school, I made a friend named "julie". We were best friends for 4 years. Now I do wanna say that she was usaully deppressed and sometimes suicidal and she would vent to me about her problems. Now what she would say would make me feel sad. Not that any of the things she vented about would involve me, but her personal problems. Now I'm a kind, respectful guy, I'll try to help my friends whenever I can, but the thing is, I liked her a lot, so I wanted to do my best to help her. I would become sad because I cared for her and she kept saying "I can't wait to die", which I didn't like hearing. It just would make me sad becaused I liked her and would try to make her feel better. 

Well me taking her vents made me depressed sometimes aswell. Sometimes causing me to be stressed out and thinking about death. I was in high school so that was a normal emo phase I guess. But she made it worse.

So my other best friend, became her bestfriend and she came to like him (Now, I  was jealous because I liked her for 4 years and have actually asked her out multiple times and was rejected all those time. We did date one time but ended quickly because she saw me as a friend, but I still asked her out because I wanted a second chance). The thing is he was getting those vents too, so he will tell me how it made him depressed too, trying to help her feel better and not think suicidal and all that stuff.  So he blocked her on everything she had with him and I kept it a secret because he didn't want her to feel bad about her self because she would think it was her fault. Sooner or later, she found out and did feel bad about herself and so did he. She also found out I was part of hiding him because I would tell her lies about not knowing of him. Before this however, I finally came to myself and knew I wasn't gonna have a chance with her, so I stopped my interests with her and stopped talking to her on a daily basis. The only reason why I dealt with her depressive vents is because I liked her.
 
So I apologized about me lying to her and she says 

"ig we're not all friends anymore huh?"

Since I've lost interest in her and was tired of the stress, there was no point in talking to her, so I say "up to you." Letting her decide.

She claimes we aren't friends anymore because friends talk to friends but I stopped talking to her anyways, but I felt like I was the asshole because I said "up to you", instead of saying "yes of course" and dealt with her problems but I didnt want to handle with her vents that made me stress and depressed.

Now, I've just been feeling bad because I was usually there to hear her vents and help her out but now idk who she talks to with her vents. It was me and her other female bestfriend but she's usually busy. As you may know already, she was pretty suicidal and I'm hoping she doesn't do anything to harm herself because now I can't help her because of me.

AITA for letting our friendship die and left her to deal with her problems?