Your W is leaving you to go be with another man, and your response is to tell her how much you miss and love her? I'm sure you've done that before - why would this time be any different? A note like that just undermines any boundaries you set - "if you walk out that door, there's no coming back! Unless you want to. Or it's kinda sunny out..."
Nobody here knows you. But why would you trust your friend's advice over all of the experience and knowledge here? I believe you got impatient. You hoped THIS note would be the one to change her mind.
My advice? There is no amount of patience that will be too much.
