  I'm lying awake at the moment. contemplating staying up to watch footie and also thinking about platonic relationships. Can opposite sexes remain friends without having any other feelings? Is it logical that feelings don't develop when ur that close to a person? Anyways, speaking from personal experience, i had a close female friend back in "sekolah menengah" and at the time i had just broken up with me girlfriend (yeah yeah cinta monyet kinda crap). Well me and this friend were close she helped me through the rough times and all that. I really appreciated her being there for me but for me she was just a close friend. I was caught by surprise when suddenly she confessed that she had feelings for me. But i just couldn't accept that there would be anything else but friendship for us both. In the end, the friendship deteriorated, although we made it clear that even though i couldn't accept her love, we would still remain friends. But it just couldn't work. Anyways, suffice to say that she's now happy in her life and i'm quite happy with mine.
The point from all this is, platonic relationships can exist. But being close to person, spending lotsa times together, being "best friends" its hard to prevent feelings from developing. Its up to u to exercise a certain degree of control. Its all good when ur like both single or something like that but what if ur already in a relationship? U spend more time with ur friend than ur partner. Things can go awry. 
