Feeling unappreciated ='/?

I've been with this guy for over 3 months now in a long distance relationship. We've always had fights..little fights that are always solved after a day or two. However, over the past month..the fights have become more and more frequent, harder to resolve and even more painful. It seems that each time, i'm the cause for the fight..due to my reserved nature, my tendency not to open up about my feelings all the time..but even then, i compensate by giving him my time and listening to his problems. But thats not enough for him.. and i can really understand it. What really bugs me is that he doesnt seem to appreciate any efforts that i make..i know he loves me a lot and hes promised never to leave me (I didnt ask for that promise).. but all of a sudden it now seems as though i'm just another girl to him.. like he takes me for granted,doesn't compliment me..doesnt see me as important. It really suck ='( Nothing i do is ever right for him it seems..so i'm at crossroads wondering what way to take. Leaving him now will make him miserable because he currently has things going on in his life.. so i feel its my responsibility to stand by him even though he fails to see that i'm there for him.. usually he'd just accuse me of not giving a damn about him. I'm really tired of it :( I know i have my faults but i dont think i deserve being treated like this because his life situation isnt exactly pleasant at the minute. Help?