First off - well done sticking to your boundaries and making sure to not cause confusion with your kids!
Is it just me or is he trying to replace the loss of his kid with my kids? Do they do that too?
BPD is an attachment disorder - so this is possible, yes
is it conscious on his part - likely no
Is he trying to be nice to me to get to them?
he is being nice to fulfill something in him - what that is, nobody here can predict.
And whats the deal with asking me to dinner and then telling me I"ll let you know when is good for him? Control? Mad I didn't jump like every other time?
yep, control - classic push/pull behavior by someone triggered
I havent heard a peep for two days... . after the bomb of texts how he misses me and wants to see me? Im back in the black now?
you didn't give him the emotional fix he was looking for, so off to find it elsewhere is all - he will likely try again.
hang in there and well done!