My partner's denial

My partner and I have been together for 3 years.  He fully acknowledges he has ADHD.  He simply refuses to acknowledge he has any of the symptoms associated with it.  I know that mood swings are common. But what I am inclined to believe that he also has bipolar disorder.  When he hyper-focuses on me I am living my fantasy.  When he hyper-focuses on another woman in front me it's as if he's in a trance and I don't exist.  He actually looks like he's hitting on her if not falling in love right in front of my eyes.  The pain this causes me is nearly unbearable.  Yet if I say anything to him, his temperament turns to rage toward me.  He blames all differences we have on me and my insecurity.  While it is true that I am insecure, I am also very social an not opposed to him talking to women.  He just doesn't know when to quit.  His over-socialization with another woman had to be addressed at his prior work place, but he still puts all the blame on me if I so much as mention the how his behavior makes me feel. After blaming me, he shuts me out for an unspecified length of time until he has finished brooding.  I have 2 questions for anyone who may be willing to advise me:

A).  How can I keep from internalizing these situations?  And,

B). How can I respond in a way that may generate a more favorable outcome for the relationship?

I appreciate any advise since I know I'm not alone here!