It's ok to check in with your old manager. (hey wanna get lunch? hows it going? etc) I went back to an old job after 9 months after having lunch with my old man

It's ok to check in with your old manager. (hey wanna get lunch? hows it going? etc) I went back to an old job after 9 months after having lunch with my old manager. I got a 25% raise out of it in total. I saw the grass wasn't greener and I came back to the job that I wanted when I had left originally. I was able to move up quite well after I came back, there was no harbored doubts.