I've been there. And not so long ago.
I talked and explained and babbled and argued and analyzed. Over and over and over again. I kept thinking that if I just explained myself better...if I was more articulate...if I could clarify my words...there had to be something/someway to get through to him.
The only result was further frustration. His denial is the most obvious when he is challenged to evaluate his situation.
You must learn acceptance. Acceptance doesn't imply that change isn't desirable or possible. It doesn't signal defeat. It's not the end of your hopes and dreams. It simply means that you recognize and accept the reality of your life as it actually exists at this moment in time.