I respect you very much and I'm sorry you don't feel appreciated or valued. It's surely not a good feeling.
To spread your wings will surely be beneficial for you. Sometime that's what we need to be able to grow. Open new doors. Walk towards a new horizon.
Maybe by doing this, when you will come to PC from time to time, you will see everything differently then what you see now. Maybe you will see what is important to you more clearly. Maybe you will really feel " why " you come here. I don't know if you know what I mean.
I know I will miss you but I do understand. It's YOU that counts.
You are a wonderful person.