I'm new wondering if this works...

[Deep]

Hope, I hope this does not come across like a glib answer (and the more experienced posters may weigh in better) - but part of the point of doing this makes the question you asked immaterial, not unimportant, but immaterial. You don't decide for him, you certainly don't control his feelings. You're not going to let his sticky little fingers slide the happiness scale of your life depending on his whims and fancies.

If he walks and stays away, that's too bad. For him. Disappointment, yes, sadness yes, devastation? Nahs, got no time for that.

If I'm pushed for a "practical" answer, I'll say it depends on how deep they're in the fog (no pun intended!). They didn't really walk away from you - they thought they were walking away from hurt, pain, boredom, resentment ... into a world of freedom, new beginnings, potential new romance, excitement. You can try to jolt them into seeing exactly what they're giving up, and there is always a chance that the delusion will wear off all the faster.

But you're worth so much more than letting your lifewait on his waking up.