OP because you're in shock, and because - I believe - that you still love him for the life you had together, even though right now you hate him for what he's done, your head's all over the place. It will take time to process. Don't rush it, and don't panic because you can't immediately see how this is going to pan out.
Why does it matter that he ended it? Is it your pride? You know what he's doing, he's still playing mindfuck games. In reality it doesn't matter a hill of beans that he's the one who physically left the house. in fact it's better, much better for you, that he left, because it means you are still in the house, whereas if you'd ended it he would have dug his heels in and refused to leave so you'd have had to live in the same house as him and he'd have continued his shit.
And you can't believe that this man has turned out to be quite such an arsehole. You knew he was a long way from perfect, but you didn't think he'd go this low.
And finally, I've said before and will again, I'm not convinced he's gone for good anyway. He's going to find some reason or some way to try to get back to the relationship. Because although he's the one who's gone, deep down he doesn't want it to end, he wants you to forget it, let it go, so that he can go back to being the one with the control. So when he tries to come back, and you (I hope) tell him where to stuff it, you'll be the one to end it finally anyway.