@sartois622,
We meet people in life for different reasons, there is no crystal ball as to if you two will live happily ever after.
6 months is still "lust" stages and getting to know each other.
22 is young and he needs to experience "life" he may change dramatically living abroad and being a different person, experiencing different things than he is used to.
If you had said a couple of years together I'd be telling you to walk and not look back, because at that stage, you should know if this is a person you want to commit to and be with for a long time, hopefully til the end of time.
6 months though creates un-certainty even on your behalf. You do not know that in the back of his mind, he is thinking that... 6 months, she's 25, more mature will probably meet someone else her age, who is working.. You state "working" means you are in the real world, yet he is actually achieving and may himself go beyond just holding a "job" and become someone, something from doing this... The real world is doing your thing that you love, your passion and and eventually getting paid for it.. Not just working.
I would say let it go and agree with regards to the "friendship" if he means anything to you, hold onto that, let things slide and see what transpires as time goes on... If it truly is love then nothing bad will happen and it will flow, if not, then you had your time with this person as far as relationships go..
It's easy to assume that it's only because he wants to sleep around and be free.
It could be that he feels you will falter and he will get hurt.
There is another side to this too.
If you agree, he will always wonder and as such, probably communicate with you more regularily in that wonder... People don't like to lose.
This may keep the relationship on a relationship level still.