long distance long term.

how do I deal with longdistance long term relationship. we have been together now for almost 4 yrs now out of which we have been long distance for 2yrs. I cant go to him because he lives really far away but he comes to our hometown whenever he can. hes going away again this time with his whole family I dont think we can survive long diatance anymore. I want to get married eventually but we are both not really settled career wise so marriage right now isnt possible.how do I get through it again especially knowing he wont be back for a long time now.:(:(