Just here to express my opinion / view on this. Feel free to do the same, I'd be quite intrigued to hear your contribution.
Why is it that everyone so freely conforms to the expectations of what a 'relationship' consists of? For example, there is a pair at my school, who have shared common interests in each other for quite some time, and although this has been obvious, they never did anything such as constant flirtatious mannerisms, being all "cutesy" and shit, but, as soon as they became labeled as "in a relationship" (on facebook mind you), all this nonsense kicks into action! Why is it, that the moment this label is associated to a pair of individuals, they take on the role of what is expected? Same goes for other things... do people actually get genuinely upset when they're boyfriend / girlfriend cheats on them? or is it only because that is what they are told they should do?