What is the difference between a close friendship and a close relationship?

Almost every one of us accepts as true that when friendship becomes sturdier, it possibly will revolve into relationship. It is not factual, the reality is poles apart. 

Consider the sort of converse you usually have with your friends when you are with them. You are all the time very open about your letdowns and deficiencies. You are not diffident of talking on the subject of your trouble and requesting friends to lend a hand. In a close friendship, you look forward to be on familiar terms on everything with reference to each other. 

Aristotle writes that ‘the excellent person is related to his friend in the same way as he is related to himself, since a friend is another self; and therefore, just as his own being is choice-worthy for him, the friend's being is choice-worthy for him in the same or a similar way.’ 

Now, the question arises that what happens in relationship then? 

Love is friendship set on fire

You might have observed masses of people initiated relationship as a friend finishes up with love. So, is there any difference between these two? Is it acceptable being a friend for certain period and then become a lover afterwards? 

Actually the distinction among love and friendship is the intensity of dedication, forgo and preservation of individual space permissible. Love goes beyond all material space whereas friendship, although competent of being inspiring has some trivial restrictions or discrepancies. Nevertheless, love can exist in a friendship because those are the friendships that grow into family love condition and not merely on account of a genetic bind or lack and thus obviously friends can become lovers and eternal partners.