I think you're doing might fine, missy, I really do.
I'll get in before anyone else can, because several members are carrying the link in my signature, in their signatures too...!
Read the Caliguy no contact guide. And know that he too, works in the same company, same building as his ex....
Short of setting up a trapeze and swinging from it naked, covered in glitter sparkle - she did all kinds of things to get his attention.....
You'll be fine. But don't respond to anything, at all. no reaction, no reply, no retort, nuthin'.......
Good luck!