If a girl starts out all casual with a guy and she doesn't tell him that she wants a relationship, it will never become a relationship. If you give the guy the impression that casual is okay with you, that's all he'll ever want. Be straight with him from the start. If he gets scared and runs away, he wasn't right for you.
Having fun is a pretty powerful way to start any serious relationship.
Before you choose whom to love, take a look at yourself, choose your own word, think about how and reassess your time when you have given life to love, Know your ready or not and make sure you are not there to hurt making regrets on your door and paint the word I wish on your window.