Who told you not to tell her you'd always be there (which I don't disagree with--not sure that is ever a good idea): was that her who gave that guidance?
It was on another site... but we just met up this past Friday and we talked and I tried to avoid bringing it up but I told her I was reading and I made sure I told her first I was not judging her... I told her about BPD and she asked me to send the link to her when I got home... now I on purpose did not send it just to see if she would remember or not and sure enough she sent me a link to a site she was reading and she seemed to agree it fits she was not upset at all, if anything she seemed to like I took the effort to read up on it.