My friend and I have known each other for about a year now, but we stopped talking a couple months ago. She's been suffering from depression and social anxiety for a while before I knew her. Whenever shit hit the fan, for whatever reason, I was her go-to guy when she needed to vent or needed help even though she had closer friends. I have no idea why she did this, but I didn't hate it. I was happy to help.

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Most of the time she'd be perfectly fine. Maybe 2-3 times a month she'd have a breakdown and every day besides those, she'd be fine. But it only got more and more frequent. Around 2 months into our friendship, her boyfriend of 3 years broke up with her, which would obviously hurt her for a while. From that point on, even when she was in a good mood, I could tell she just wasn't the same. The times she needed my help became very frequent, which is to be expected. She needed someone to cope with.

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A couple months after that, her now ex-boyfriend said he started dating someone else. This made her even worse because to her (and I assume many other people), finding a new date a couple months after a 3-year relationship is pretty fast. I still helped her when she needed it, but I didn't think I was doing anything special. Like, it may have helped, but any other one of her friends could say the stuff I was saying to her. Just imagine your most cliche therapist lines. This will be important later.

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So a couple more months after this, she wouldn't be as hurt as she was before, but her mental disorders were clearly worse than they were when we first met. We would rarely do the stuff we used to do every day for fun. When I would try to talk to her normally, she didn't really seem into it, so most of our talking came from her breakdowns now. Plus, all together, we talked way less then we did even a month from this point. From what I saw, it seemed like she wanted help rather than just someone to vent to; however, most men seem to want to help rather than just listen, so I'm not so sure on that. I felt like I couldn't help much because I didn't know much of her situation between her and her ex.

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So I asked her one day if she could tell me the story between him and her. I told her she didn't have to tell me right away, whenever she felt ready. She'd been ignoring more for about a week (most of the time she'd at least talk to me and be unenthusiastic about it), but she didn't reply at all to that message. I expected her to at least reply with something like "I can't right now but when I'm in the mood." or maybe "I really don't feel comfortable talking about that". Her not replying to that, a couple other messages before that, and just talking to me less and less, in general, made me think she doesn't want to talk to me anymore. Like I said before, I felt like any of her other friends could do what I did so I didn't think she needed me. I'm now getting 3rd party information that this wasn't her intent, but she's not all that worse without me.

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The main reason I chose to stop talking to her is that we completely stopped doing the stuff we were doing originally, the stuff I became friends with her for. Every time I tried to give her advice she wouldn't seem to take it, and she'd fall back to me again and it turned into an endless loop. And since I thought anyone else could do the generic therapist gig I was doing, I felt like it wasn't worth it for me.

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So AITA for leaving in this situation?