Hey guys, I (m29) have a close relationship with my friend (19f) who I have known since she was 14, she's like a little sister to me and I love her very much. I'm gay and her parents have legit treated me like one of their own for the past 5 years. 

She has had emotional and behavioural issues for the last few years, I'm aware she's very manipulative and two weeks ago she had a very messy breakup with her boyfriend of a year. I myself have bipolar disorder, and I recognised that what she was going through wasn't just your basic depression so I advised her to get a referral to a psychiatrist and to go to therapy. Turns out she has a diagnosis of bpd, which honestly doesn't surprise me. 

But why I'm here is for advice on how to help her now that she has her diagnosis. I know what living with a long term mental illness is like, but Bipolar disorder and bpd are two very different things. I've also been hanging out with her a lot more since her breakup, and I'm worried she has come to rely on me more than she should. I'm going on a trip for work soon for 2 weeks and I'm worried that without me there she'll slip into depression. I've set her up with Stardew Valley and discord so that we can play while I'm away but again, I'm just worried. I know what it's like to be young and to recieve such a serious diagnosis. 

If anyone could give me any tips on how to engage with her in a way that's healthy for both of us, that would be great. Or advice on bpd in general, any information would be awesome. 