Do long distance relationships last???

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My boyfriend and i have been neighbours for several years. Well despite being neghbours we never talked much, just a hi or a hello. Well we recently got quite friendly over the new year and on valentines day he just poped the question....yup he proposed. well problem is he is still studying and i need some time to start with my furthur studies as well. plus of course there is the distance between us....hes in the states and im here in pakistan. He needs time to set up and get a place before he actully makes the final commitment. should i trust him and wait or should i think otherwise???? please help me someone, anyone. i need good damn advice.....esp i like to hear good feedback from guys.