Female and male can be just best friend?

Do you think that's possible happen to guys and girls very close together and that nothing related about crush.. Cause majority said that when a guy interesting to that girl they will trying hard to get attention from that girl and start to stay closer to her. From my point of view if a guy suddenly chat with me n like everyday I really think that possible to be just best-friend.. I think that's the cooler things ever happen in friendship...  

We all know that same sex can be best friend.. But why not happen between male n female? There's  no rules about not possible right? Like who don't want to be simple ? If most of the people are living with simple mind, there won't be happening of complicated life.. All human can avoid is trying to get the simpler life and enjoy meeting people like nobody business,& improving social-friendship. 

All I want to focus now is making friend/best friend around my social life.. That's the basic need in my life now!! If you don't have the basic I think you are no qualification to think about relationship. Handle a relationship or another half really have so much responsible to take.  Everyone have the limit.. If you think you are ready for it go on.. But if you are not ready just forget about being in relationship.. Because you also don want to end up a relationship and lose one of the favorite friend or best friend right? Isn't fair for anyone's!!!