I have a close friend who knows I have BPD and their actions as of late have been rubbing me the wrong way. They always claim to have the exact same experiences in life as mine, my conditions, my medical history, my very specific triggers etc when before they never brought any of it up. They always seem to talk about things that happened to them and their friend with NPD who i do not like because they make me extremely uncomfortable, when i try to say anything about what I'm struggling with. When I'm upset they never try to help, even tho when they're upset i do everything I can to reassure them and be there for them, no matter what, they just seem to try and fight with me, and things they never had a problem with before start to become a problem, and it makes me feel stupid and awful.

How do i bring up these feelings with them? I don't want to seem like I'm being manipulative or gaslighting or whatever. They've accused me of guilt tripping before when I feel they have guilt tripped me.

I get really upset by them a lot and they never care, I don't understand why.
How do i know if I'm being manipulated by them? Am I just overreacting? I'm sorry if I am being dumb.