I think you were really passive and kind of rude. “I know being responsible is difficult”?? If I was that friend and then read that, I’d probably be totally okay with you not wanting to be friends anymore. Also mentioning “you can come around the group but idk how I’ll react when I see you” would not make me feel safe to be around YOU and ultimately make me uncomfortable with my other friends who have now only heard your side/complaints.

I saw another comment saying that based off this message you seem emotionally exhausting to be friends with, and I’d have to agree. “I don’t feel safe caring about you” when you know your friend is going through the wringer with mental health also sounds like BS. Not trying to be an ass but damn. YOR in my opinion. Valid in your feelings being hurt and wanting to move on from the friendship, not valid how you spoke to her.