Best friend is threatening suicide and has an unhealthy relationship with her ex. How can I help?

Billie_
Been a while since I’ve been on here but I’ve searched the internet and can’t find any sort of advice for this.

My best friend (19F) and her boyfriend (19M) broke up around November. They’re still sleeping together, cuddling etc while going out and seeing other people. I can see my best friend has a bad attachment to him as she won’t let go and isn’t looking for anyone else. She will always make an excuse for not finding other men attractive.

Anyway so recently she’s gone actually insane. She attempted suicide a month ago, obviously me and our other friends were shocked and worried about her. But as time went on we found out it wasn’t that simple and was likely for attention. She took a large dose of paracetamol and immediately called her ex boyfriend after telling him what she’d done. Now as someone that’s attempted suicide in the past, if I wanted it to work I wouldn’t be telling anyone what I had done so it seemed suspicious.

A few days ago, she got drunk and was wandering by a train line by herself. Same thing happens again, she calls her ex and tells him she wants to jump. He cycles over the fields crying to check on her and is seriously worried.

It seems like she is trying to blackmail her ex into staying with her and I’m not sure what to do at this point as she isn’t listening to any reason and is extremely defensive whenever you question her.

I can tell she’s obviously going through it, but honestly I’m lost in how I can help her at this point, any advice is greatly appreciated. Also not sure if I should reach out to her ex boyfriend and encourage him to walk away as it’s clearly hurting him too.

Tl;dr: Best friend is attached to her ex and is threatening suicide.
Best friend is threatening suicide and has an unhealthy relationship with her ex. How can I help?
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