The girl asked me if I liked her, but I didn't answer her directly. She said, then why did you keep sending me messages, and finally you said not to send him messages to hack me?

You didn't answer directly? What do you think? Do you like people or not? Is it because I need to send her a message at work? If so, you'd better make it clear. This girl obviously doesn't like your "negative answer", otherwise she wouldn't have told you not to send her a message, which made you black. Do you like her? Still not sure

Are you still unsure of your own thoughts and afraid to move forward? Are you afraid of being rejected? Or just want to have fun, have fun. I'm not sure what state you are in, but the best thing to do now is to tell her what you think.