I recall this feeling with my ex during the last month of the relationship where it almost felt as if she was powerless to splitting on me and knew it was happening.
She wasn't powerless, on the contrary, she was Power-Full. She was so powerful, that she's got you still thinking about her 5 months later after the split. You were right, she wanted to manipulate you to the point where
you were powerless. Powerless to stop whatever it is she wanted of you. She's an adult, she could help herself. She could get help herself if she really wanted to change or thought the problem had anything to do with her.
They don't do good with abstractions or emotions, so the emojis make sense. It's also why she didn't get your jokes. I am guessing you're a funny guy, I know you haven't shared it here, but I get the impression you could crack a person up. Your ex never laughed at your jokes right? Mine either. She would just say "Funny Guy" in a sarcastic tone, and I told some real knee-slappers with her around.
A lot of humor is a play on words, and this is lost on the fragmented BPD mind. For example:
Knock Knock.
Who's there?
Dwayne.
Dwanye who?
Dwayne the bathtub I'm Dwowning
Knock Knock.
Who's there?
Centipede.
Centipede who?
Santa-peed on my Christmas Tree
You know, Homophones, always funny.