well my wife is a pharmacist and she had to go 5 years plus a intership... there was no way I wanted her to stop her education, her career is hers and she should be the best she can.
I would talk to him, tell him how you feel, we did not live together either, due to her family.
but she had no problem leaving pictures or ad's of rings around my house LOL
or wedding magazines..lol
suttle hints are fine.
Just ask him were you stand in his life and are you wasting yours?
My wife's sister wanted kids, her husband said he wanted kids....until they were married then he said he did not want children, they are still married, but you can tell she is not "happy" even though they own 3 houses and make a buttload of money....they do not have the happiness, becuase she feels she missed out.
so find out where you stand, just so you know your future.
Do not view anyting as a waste, just part of life.
I think he wants to marry you, but just feels he needs some more time.
5 years is longer then most marriages.