Right intention

Having said I will have to source others re 'right intention', I forgot to do so! Here is one link http://www.vipassana.com/resources/8fp3.php but there are many more if you Google the term. There is also right view from which right intention comes. I had read about these concepts but the term came to my lips in describing a relationship with a friend, and referred to something I have thought about a lot - that it is best if your intentions are pure with regard to relationships, but how easy is that to create? That is, how often is there a subtext of self-interest? How genuine is the interaction, how caring?