On relationships

There's this girl in my class, we've been on a few dates but I decided I like this other girl better. I'm too scared to ask out this other girl cuz I don't want to hurt the other girl's feelings, and I don't want to be embarressed if she says no.

Also this other girl is moving after the summer. I just don't know if it's even worth trying.

How do you know you like that other girl better if you haven't even asked her out yet? Have you spent time with her in another manner?