The "Best" Friend

I'm the person you spent time since birth. The one that you always play with when we were still innocents. I'm the one that makes fun of you, the one who supports you on everything you go through. I'm the person that you ended up crying on my shoulder. I'm the person that has been with you for eternity,the person that you trust with everything. I'm that person,your bestfriend. But then everything just changes in one sinful mistake.....falling in love with you.