Left flying in my 30's after two years on the 737 back in '06 and didn't regret in until fairly recently, but life is too short, and since leaving I have changed and matured I feel in a way that would have not been possible with flying.
Overall it was probably for the best although my situation was a lot different than yours (I basically stormed out after a volatile build up over a few months) and in the end only you can answer the question of course.
Good luck either way.
PS. I didn't give up PPrune though
