Hi guys, my name is Jules

First of all sorry if my English bad, not my first language. So I've been lurking this subreddit for a while after I got my diagnosis. Don't know if it is worth mentioning but my BPD diagnosis is the ICD-10 one.

Ok, so currently I am dating a psychologist. I am scared to death to tell him about my diagnosis. He literally thinks I'm this great person, and he keeps asking what is wrong with me because no one is "that perfect,". 

So at this moment som too scared, because he will probably analyze everything I say and to, especially from the moment I tell him. I feel like he might actually understand how fucked up I am, and leave me. So do you guys think I should tell him?

TL;DR: Diagnosed with BPD. Currently seeing a psychologist. Not sure if I should tell him about my diagnosis. Afraid of him leaving / judging me. What should I do?