Any advise please?

There's a girl l love and I've just told her this after 2 years of eating for her. She has told me that she likes me too but she said she's too difficult to handle and she's scared tol fall in love because she thinks that i will leave her one day. I talked to her about this made her understand that I'll never leave but she kept saying she needs more time and she's afraid, it's a clear sign that she wants me too but she's just scared now I don't know what to do? I would cry after every hour by just thinking of her even though she haven't rejected me or anything but i don't know why i cry every time i think of her.