Am i over it????????

Is it normal when u have been with ur boyfriend for awhile that u start to feel.....like u need them less or something?i dont know how to describe it but for example my boyfriend is away at the moment and i cant say im missing him loads,i love him and everything but i guess i just am no longer infatuated or dont have that same feeling i used to get?is this a sign of something more serious?this feeling is kind of worrying me?