Standing your ground isn't being controlling. In no way should he leave, and I don't think its controlling to say "I'm not leaving the house" or the like. He isn't making her leave. What he can say are things like "I'm not going to live in a marriage where I am disrespected," etc., or something along those lines. But, he needs to back his statements up, too. He can let it be known that he won't leave the MBR, house, etc., because he isn't the one who left the marriage. If she wants to leave it, then so be it, but he won't. Heck, I'd even say if she were to sleep in the MBR, then she should expect to be hit on... haha.
There are moments in this life when you are so confident in the rightness of your actions, that not even for a second do you consider the option that you might be wrong.
