I will always say never fall in love with your best friend....... Never untill you are sure that if he/she has the same feelings for you!! First Both of you become friends at first start talking to each other not daily but are always in touch, after sometime you are close enough that you call each other best friend, you talk to each other daily, you just become a part of each other's life, then you start to share things with each other all the childhood memories all the fun then you talk about each others families. You start to have fun and feel good when you talk to each other, you share your likes and dislikes and if lucky both have same likes and dislikes, you then start to have good ,late night and deep conversations with each other not the usual talks like "hi! How are you?" type but you rather start with "do you know what happened!? " we all become very happy when we have a friend with whom we can share anything without the fear of being judged, when someone other than our family genuinely cares about us, always asks "did u had your lunch?". Then comes a time when we become very close to them, so close that they understand us like no one else could, they know your lifestyle, your habits, all your moods, they understand your fake smiles and know the sadness behind your smile they just become your other half they know you more than yourself. You feel so happy when your bestest friend identifies your fake smile and says " I know your smile and I know something's wrong. Others may not be able to know your real and fake samile but i do know it so tell me what happened? " It is the best feeling and as well as the best thing you'll hear. By this time now we become so close that not talking for just a day feels like year! You start to miss him/her badly! You become sad unknowingly. The next day you receive a text frim him/her and you become so happy that you start by saying where were you yesterday and, like i said it feels like year by not talking for a day, i missed you and start by telling things that you did yesterday!