You choose one.

You choose the one you like, why would you want to choose the girl you don't like?

What does one have to do with the other, go for the one you like and be honest with the one you don't.

How old are you?

But what about the other one?

You date both of them if you want to and they will date you.

You like one ? Does she like you,
One likes you ? Do you like her ?

There is no need or reason, esp if you are just "just liking" someone to only see or date them, Dating is just that, you date, and after a while of dating, you may start only dating one person