I think I agree with mozza, But I'm not sure you sound like you can do this with no expectations.
Sounds like you threw your hail mary... and didn't get the result you were hoping for.
I know I'm saying this in a clunky way. .. I don't mean it to sound harsh. But my gut is telling me you haven't really let go. .. what do you think?
If he comes back, don't you want it to be obvious and very clear? He knows where to find you if he wants back in. I'm worried you are setting yourself up to be upset over this dinner. . Or what happens after. ..