obviously it will affect your friendship....coz if your behaviour changes as compared to what it was...and if those are your close friends...they would notice it.......and most likely ask you for the reason.......and if they can handle that reason........then hats off to them.....but if you place yourself in their shoes...then it will not be the same as it was........
Its only but human.....
So it all depends on a lot of relative things!