I've NCed as I don't want this linked back to me or the friend in question, honestly.
I've had a friend for 5ish years, since we met back when we were at school together. At the time I had some seriously bad mental health problems (picture a full Britney Spears style head shave) but I often gave her a lot of my attention and affection as I wanted her to be alright. She's about a year younger than me, so that probably played a part too.
I got back in touch with her very recently after creating a new social media account - not my choice, but necessary to get some work done. She's been a bit up and down since I created the account (she went on a date with an "ex" who she'd never met before, which entailed a weekend away at a hotel where they didn't speak to each other. She was telling me how much that upset her, while still posting loved up stuff about said "ex" on her story). She's also gotten sick while at the hotel, which might be Covid, but is still going on public transport, staying at a hotel and walked around the busy capital city while ill.
She's now spent the whole day sending passive messages like "Speak." or "So lonely." or things like that to me, as well as putting them on her various private stories. She's now messaging me telling me she's suicidal and she doesn't want to be here anymore.
I feel guilty for not wanting to help her but similarly I'm a bit shattered - I've got a lot of my own MH worries to deal with right now, and I'm not sure she's got the capacity to change. I think she has a kind heart but is just not knowing / unwilling how to help herself. However, I acknowledge this may just be selfishness on my part, and she put up with my MH issues 5 years ago (though it wasn't to the counselling level I'm trying to do right now if I'm honest).
So;
YABU = She put up with your MH issues and so you should be making an effort to keep in contact with her
YANBU= You didn't expect the same level of support from her and you shouldn't feel guilty for being worn out by being in contact with her