What do we want in life? To be effective or to be efficient. Being effective is attaining goals set while being efficient is reducing wastage. It can be used in many aspects in our life, like family, relationships, work, friends, studies etc...
I'll focus on relationships for today. Effective is loving a girl that you always love, efficient choosing the girl that loves you most. Being effective might not always be the best, you might end up hurting yourself if she doesn't want you. Being efficient would not hurt yourself, but it might not be really wanted. Having only 1 will not work, a relationship must be both effective & efficient.
Its best to choose a girl that you love most, and she loves u just as much.. When will such girl ever come into my life? Hopefully soon...