How to do the future talk

I'm finally finishing school and starting to look for full time jobs. My SO and I have been doing great for 7 months - no fights, best friends, only the rare conversation about commitment issues after too much wine. He has a stable job that he has to stay at for at least another 4 years. I don't know if I could or would want to stay in our area for that long if we weren't together. How do I bring up the question of if he thinks it's worth me staying because he sees a future with me without sounding like I'm fishing for a marriage promise? Both of us agree that needs to happen after years of knowing each other and I know if thinks I'm pushing for that now he might run...