I think it's about knowing someone so well that you feel like you've known them for 100 years (especially since he met when they were kids and they grew up together).
Whether they were together romantically or not, it seems they've grown a little apart yet - hence the "only wishing well" part. Yet he's still outlining they have/had some kind of relationship (friendly or no) he won't forget and still feels he's known her forever. Especially when he says "coming Thursday evening," it seems random and mundane - like they're both so comfortable with each other, their relationship seems both old and long lasting.
Just my interpretation.
I think it's about knowing someone so well that you feel like you've known them for 100 years (especially since he met when they were kids and they grew up together).
Whether they were together romantically or not, it seems they've grown a little apart yet - hence the "only wishing well" part. Yet he's still outlining they have/had some kind of relationship (friendly or no) he won't forget and still feels he's known her forever. Especially when he says "coming Thursday evening," it seems random and mundane - like they're both so comfortable with each other, their relationship seems both old and long lasting. Just my interpretation.