Hello I'm looking for some advice. A little backstory first. I'm a 28yr old male and about 7 months ago I reconnected with an old friend from high school (F28), she lives in another state now, we did meet once in September but we talk a lot. In the 10 years we didn't talk she has been diagnosed with BPD. I read some articles and looked up symptoms and shit like that, but I've been reading on here and it's become clear I didn't understand the scope of it all. Infact I'm pretty sure i have helped trigger negative feelings and mood swings. I care for her more then just friends, that's a pretty complicated situation regardless of BPD so I wont go much into that. But over the last 7 months we've grown to be very close friends, I would say bestfriends. She was always very loyal to me, and a great friend before, probably the bestfriend I've had in my life. 

I just want to be the best friend that I can be for her, she deserves it. I feel like shit because I know I've made it worse at times. Currently she has gone into what she called ghost mode, took down her Facebook and we haven't really talked in a while. I'm looking for advice on how to be a good friend to her, be supportive and understanding but not dismissive. Also I have texted her a couple times since "ghost mode" just to say goodmorning have a nice day, stuff to say I care. Should I not do that? I was very depressed for years and I wouldnt say I'm out of the woods yet, but things for me are looking up and I know little stuff like that would mean a lot to me. But I don't know, I'm worried I could be making it worse. 

Absolutely any advice is greatly appreciated, thank you for your time lovely human beings.