Heh... I recently got a call from an old job wanting me to come back (I didn't even serve out my notice). Anon, we know it wasn't the best situation but please come back, yeah no... I fucking told you I couldn't staff the department at the rates you were offering, which resulted in me working my ass off to pick up the slack. You could have fixed it when I was there, but you fucking didn't so go fuck yourself.
I have worked at far too many places where I showed them "the way" to success and they refused. I put in my notice and they all of a sudden wanted to "give me a new project with all of the freedom I wanted" (what I already proposed) but with no resources, no extra pay, etc.. They even did the "The grass is not always greener". Mother fucker, You have already screwed me for years and now you are trying to gaslight me? Go and fuck yourself.
Yep, if they start promising stuff after you put in your notice forget it. They had their chance.