I can relate with your situation, I have let myself be take for granted and have compromised my own needs and desires for the sake of my wife and kids. While it would be easy for me to blame my wife, I have come to realize that I need to shoulder some blame as well. I also know that the only variable that I can control is myself, so I sought the help of a therapist and have been making some good progress.

My advice to you before you decide to leave is to look at yourself honestly and own up to your part. Seek some help from a therapist and work on yourself before you decide to leave everything you have worked for.