equally necessary

i was up this morning way too early...couldn't sleep and not sure why because i actually feel like i could go back to bed but it's too late at this point to try for a few more moments of sleep...any way, i was up on the internet checking out the movies for this weekend and i was reading a review by roger ebert and he said "...it's so much easier to fall in love with someone who is necessary to you than someone you are necessary to." and i thought that was in interesting statement...so here's my question how do you find someone that is as equally necessary to you as you are to them? it makes me question my last relationship...i know that he was necessary to my life and my well-being and my sanity and he made me laugh and helped me in so many ways...i wonder if i wasn't as necessary to him...i have heard people say that the guy has to be into the girl just a little more than she is into him and i don't get that part because i just want equality in my relationship and it also seems like nice guys always want bitches...which i don't get at all because i want a nice guy and i am not a bitch [i mean come on anyone can pull out the bitch but, on the regular...no, i am way to laid back for all that stress and drama] so, back to the original question...equally necessary to each other...is that a possibility? and if it is where do you find that?