Contrived plot occurrence develops in thoroughly immature and underdeveloped fashion to put said Boy and said Girl in almost constant contact with each other so differences of opinion, lifestyle etc. can rub off on one another. In everyday life, our general line of thought is that if we don't like someone we do our best to avoid them where possible. In 'Rom-Com Land' our "differing personalities" must end up in constant rotation of each other so cue improbable reasoning for them to move in together, be employed alongside each other, go on a road-trip together and the like.