<human>: Give me a shortened version of the text

My SO and I have been dating for 9 months.  We were long-distance for about 4, until I accepted a job in his hometown.  We moved in together about two months ago (house is completely his).  He has lived in this town his entire life, and has a fair amount of family there as well. 

While I could feasibly stay in this town for a couple years by changing careers (currently working for a national company that promotes only from within), I love my current job and could move anywhere in the US or abroad with it.  Typically people move every 3 or so years and I am not due for a promotion for at least two years.  His job, on the other hand, is extremely malleable.  He could find one anywhere, probably making more money that I can with mine.

I've talked with my SO about what might happen when I get offered a promotion somewhere else.  Would he move with me? Should we be looking for a certain location? We are not looking at starting a family and I do not intend to just "not work."  The city we are currently living in only has about 60k people in it, and is an hour and a half from anything worthwhile. I have already stated that I don't want to stay in our current city for more than 5 years- I really don't think I'd be happy there long term.  The best answer I can get out of him is "I will move if I need to. I'm comfortable here without moving. It has everything I need."  When I ask the hypothetical of being offered a job in a city a couple of hours away, he kind of just shuts down and says that he's happy where he is right now and that he likes his current job.  

I am deathly afraid that I will get an offer in a few years and that he will not be willing to move. What should I do, if anything?
<bot>: Boyfriend is happy in the city we're in, while my job may require us to move every 3 years or so. I'm afraid he will never be willing to move.