<human>: Can you give me the gist of the text in a nutshell?

Two days ago, She says " You know my rules, right? And if you still wanted, maybe first, before making everything official, we can go on a date and see how it goes. " 
And out of the blue, I just got this from her. "Hey..so I need to talk to you. I unexpectedly met someone. And I like him, a lot. Long story short. And I just don't know if I can go on that date anymore..I'm so sorry. " Does anyone have an idea about what could have actually happened? 
For some back story, about a week ago, She told me She wanted a chance to date me. I told her Yes.
When We were talking the other day is when I got the first message. 
What should I do or say?
<bot>: Girl wants to date me. She magically meets someone new and doesn't want the date anymore. I need help on what to do or say.