Bend her over, grab her tits, fuck her up the ass and tell her "you don't fuck nearly as well as the chick i just dumped, I'm leaving you".
Did you miss the bit where the threesome was with her Mom. I suppose that might be ok, but ewwww...genius! xDD what he said . xD she might be so disgusted that she will leave you right there or agree to a threesome.. Either way, you win!
You respect these women! Bullshit! You don't respect either woman if you did there wouldn't be two in the first place.
Basically just tell her and live with it. Yeah it sucks but it's almost always the right way to go. And yes, upset women can act crazy, stalkery, and very, very, angry...
I held off on a breakup for a few months for one reason or another just to find the perfect time and place. I rehearsed anything that she might throw at me, which helped me remain cool, calm and collect. Yes, she did try to be confrontational or pick a fight, and when I did try to rebutt, she escalated (my thought at that instant was that I should've hired a court reporter for how she was twisting one thing), so I backed off. In the end, there was no final hug or kiss, just an outstretched arm from her for me to give a limpy handshake.
And there is actually nothing wrong at all with what you did there... Wait or not that's the way to do that.
Videotape yourself getting head from a hot sp and forward it to her email.