Relationship help please?

ive been with my boyfriend for 2 years. were both 17 and going away to college next year. here is the deal: i feel like he doesnt love me as much anymore. he could be in the comfort stage, but i have no idea. he doesnt surprise me anymore, hes not 'lovey' anymore, he always wants to do something sexual and i mean ALWAYS. ive talked to him about this but it usually ends in a fight and he tells me hell be more lovable but he never continues upon it . plus he doesnt show his emotions at ALL. i know i love him, and i dont want to hurt him at all, but i dont know what to do. should i move on?