For those who don't know, "venting" means telling somebody, usually a friend or family member, something about your mental health issues. It's usually triggering, and you ask the person first. Due to this, I won't go into detail onto what they said. I also think that the ages of this story aren't very important, so they might not be mentioned.

I [NB] was messaging a friend [F], it was through texting and I basically said to a friend to not vent to me. This was because I wasn't going through a good patch, and they saw me as their therapist. At one point, me and them were talking, and they began venting to me. They didn't ask. They just started venting? I got angry, but I didn't want to snap at them. So, I let them continue, and then tried to help, but I think everyone was really stressed, and I was even like crying, and told them afterwards that this time it was okay, but please do not do that again, and I wasn't in a good state. They said okay, and understood. They said they do that a lot, and I halfway forgave them.

Later or the next day, I said the same thing. "pls don't like vent rn bro i just idk if i can deal with that rn." I realized it was really bad up of me to not give them other resources to talk to, and I admit that. I just wanted a break, since this usually happens, and I was already stressed. The person agreed, but not much later, proceeded to talk to me about an awful abuse situation they were going through. [Again, not giving any details. This has just been happening for a while and I have been trying to help.] This is where I'm probably an asshole. I basically snapped and told them "I SAID TO NOT VENT TO ME." And just told them that "I CAN'T DEAL WITH THIS SHIT RIGHT NOW AND I TOLD YOU THAT SO WHY ARE YOU STILL DOING THIS??" They told me that if I was really angry that they could just stop talking to me, so I stopped. Then they continued for a small bit and then stopped.

I did spare some details which I could answer in the replies, but I feel awful and need to know if I am TA. So, AITA?

Edit bc I forgot to clarify: We had another friend who she could contact, if I was the only person I would hope I wouldn't freak out as much, and the other person wouldn't mind.