You're actually not real happy with your wife's plan, but you also don't want to come across as uncaring or petty or possessively jealous --and you know that he thinks your wife is quite attractive and that she thinks the same about him -- so you agree with your wife that this is the right and best thing to do.
And as you go to give him a call, your wife calls out to you "When you tell him the plan -- which I'm sure he'll agree to -- you should make it clear that the "a couple of weeks" timeline is not set in stone, and that if he still needs more time with me after that, then of course, you will stay at his place for longer so that he can stay here with me for, basically, as long has he wants and needs. We should just let him decide when he's ready to move back to his place -- no matter how long that turns out to be. And given how painful it seems to have been for him for his wife to suddenly walk out on him like that, I wouldn't be surprised if it ends up being months rather than weeks that he'll feel he needs to stay with me -- so you should tell him to pack as if he will be here for a very extended time.
And of course, you should pack for that possibility too -- and you will need to clear dresser and closet space for him to use while he's here. That way, he won't feel as much like guest, but hopefully I can make him feel almost as if the house, and especially the bedroom, are really his for as long as he's here."
