why do u get attracted to just 1 person and not every1?

That's because beauty is in the eye of the beholder. Every one of us have different preferences, likes, cultures, etc. Each one has his own definition of beauty.

I do nt believe that there is certain law for attraction but its something unknown. I think its in your own eyes, as I only get attracted to my girl, its just in our brain as to what we think and see in the person in front of us and what we consider them. We might as well get attracted to thing that we like and want to see in people, and when those qualities are their in that someone we just go bonkers. But to tell you that attraction is far from any emotions, if your are emotional about somebody then you are ready to accept their mistakes with their correctness. And when you are just attracted then its quite different.