<human>: Can you condense the text into three sentences or less?

I started seeing this girl about a month ago after finals finished, and she is practically in love with me. We're still in high school, and in a few weeks there's a dance where the girls ask the guys out (its called a turnaround dance). I asked her if she was gonna ask me because its getting close, and she told me she's going with a friend who is three years younger than her, kinda as a joke. She also doesn't want to go to prom at all. We're both very clingy, so I'm extremely jealous that she asked a sophomore to the turnaround dance even as a joke without asking me first. 

I want to tell her how I feel, but at the same time I want her to have a good time. I don't trust her yet as we've only been seeing one another for a month, but I really like her and I dont want us to break up over this. Should I ask her not to go with him to the dance? Should I ask her to go to the dance with me?
<bot>: Girlfriend of a month is going to a dance with her guy friend whose 3 years younger than us and I'm jealous and mad.