Its far more difficult to remain friends than most people think. Better plan to remain polite and civil, as you decided. Maybe at times he feels a bit lonely, but you don't have to respond to his invitations to chat - you can give vague responses and change the subject.
As for him staying with you, that could of course cause problems - lets see what others readers suggest. Does he have other family or friends with whom he could stay ? COuld someone else of your family or friends stay with you at the same time, so he wouldn't be alone with you, if you did allow him to stay briefly with you ? Either way, you'd need to give him a calm chat about how the relationship really is over, and how it'd not be wise to spend extra time together or to become too friendly again.
Has he expressed any opinion as to how he wants things to go, and whether he udnerstands the idea of a polite but cool relationship now ?
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