I made a similar post in r/relationships, but I'd appreciate advice from redditors who are more familiar with BPD who can maybe help me figure this out. Sorry for the wall of text, but I really need some help here!

Background:
I've known my friend D for a few years (we went to the same high school), but we've only become close recently (a year or so). She has BPD and has dropped out of college and is living at home for a while. I've got a pretty good grasp on the disorder through research and also through talking with her about it. I want to emphasize this though: Her disorder is NOT and has never been a problem between us. She has been nothing but lovely, warm, and helpful towards me, and I have been there for her when she needs me. We talk a lot about her disorder and her problems with her abusive ex bf. I also feel very comfortable talking to her about my issues.

Problem:
I've been feeling increasingly strong romantic and sexual attraction towards her for a couple months and nothing I can tell myself has helped me get rid of those feelings. It'll be easier if I map out some bullet points to get the facts straight.

Facts:

* We are each aware that the other is bisexual - not an issue.

* She is not 100% mentally/emotionally stable right now.

* We are incredibly compatible in almost every way.

* She is struggling from emotional abuse from her ex boyfriend (he keeps tricking her into having sex and then abuses her/ignores her for weeks). This coupled with her disorder makes her extremely emotionally vulnerable, something I would never want to take advantage of.

* I am the first person she goes to when she needs to talk about her feelings or her love life.

* She is very open-minded. I can tell her absolutely anything without fear of being judged and vice versa (except how I feel about her haha).

* This is the first time I've had serious feelings for a girl, so that's also a little confusing.

I don't know whether to pursue anything romantic and/or sexual because of **a)** her current mental/emotional state and **b)** I'm terrified of changing our friendship. She has become one of my closest friends and I love her dearly as a friend. We cheer each other up and make each other laugh. It's incredibly easy to just hang out and have a good time doing WHATEVER. I've rarely felt more at ease with someone than I do with her.

I am also afraid that if I tell her I'll just be causing her MORE problems to worry about. But it's becoming painful to talk with her about her ex or other aspects of her love life (crushes, tinder, etc.). I just wish these feelings would go away. Can anyone help me?

**TL;DR; I've developed strong feelings for a close friend who is struggling with BPD and I'm scared of damaging or changing our friendship if I say anything. Need a way to make these feelings go away.** 