Hi,
I suggest never bring money in b/w love, money ruins relationship, if it is true love then I don't think whether he pays re you pay is the question, obviously once you are married both would be sharing up responsibilities, there are things money can't buy. But again if he has and doesn't spend then its different but as you mentioned ut of you are yet to grauduate so support him and you would be happier rest of life :) good luck