I can't help but feel to some extent he hid this from me (I dont know exactly how to explain).
it stands to reason. we all, to different degrees, hide the parts of ourselves we dont want to see, and dont want others to see, and put our best foot forward. people with bpd, who struggle with shame to a pathological degree, even more so.
I'm going to talk to my therapist as well, any resources off the internet you could suggest other than that?
read the lessons. read them again. practice the tools with everyone you know. post questions about them. bounce the information youre gaining off of your therapist. practice applying them in other peoples threads - this will build your skills, as well as your support system.
why dont we start with the latest conflict between the two of you, in as much detail as you can muster, and we can walk you through it?