Wow, the end of the recording has been released and it pretty much absolves Mel of any wrong doing, as you can see by his last words.
Gibson: "No more pain, bitch, you took my heart for granted and ran it straight into the planet, into the dirt I can no longer stand it. Now my respect, I demand it. I'ma take control of this relationship command it and I'ma be the boss of you now, goddammit! Fuck you, Hollywood, I'm leavin' you, my life sentence is served, bitch, and it's just..."
So all that ranting was actually about Hollywood, not her. Go Mel!