Well, it happens to all of us. You are not an idiot. Although I don't think what you are describing is that bad. What did he say when you brought it up? Why does he say he wants to file in 3 weeks? Just curious as to why he wants to wait 3 weeks if he is so intent on doing it.
The only bad thing about bringing it up is he may see it as a desperate attempt from you to have him hold off on filing. When you asked him to leave did you ask him to use it as a "trial separation"? Something like you could separate and if in 3 months (or whatever) he still feels the same way then he can file? He may not be receptive to that though, my H wasn't. He was DETERMINED!
Sounds like you have a great weekend planned!!!! A glance your way at the bar will be great for your PMA! Have a great time.