I've had the long hair for 6 years and recently adopted the short hair (2023). This is the closest they have been to each other since. So much for getting another cat for companionship. I do work with them to try and build a relationship, but cats will be cats.
Ours were much the same for a long while, until eventually they got so close they would sleep together and one would even lick the other.
Don't give up just yet!
I'll keep at it! Thank you for the vote of confidence.