<human>: Can you give me a shortened version of the text?

I'm actually posting this for my little sister who doesn't reddit, she typed the following:

So I'm in grade 12 and facing a lot of problems with prom. 

My friend Nancy had an assumption that she was going to go to prom with a guy named Zach. They're not dating or anything and hadn't even talked about prom. 

Me and the rest of Nancy's friends knew she wanted to go with him, but we didn't know if Zach actually wanted to go with her.

As a joke, I told Zach that we should go to prom together. He took it seriously, and told me he wanted to go with me. I said yes. 

Nancy was really upset with me because she knew that I knew she wanted to go with him. But he told me that he was not even thinking about her and didn't want to go with her.

All of my friends are pissed at me for doing this to her, and they are telling me to tell Zach I can't go with him anymore. But if I do that, they probably still won't forgive me, and then I won't have a date. They refuse to talk to me because of this. I have other friends so it's not like I'm completely alone, but I'm trying to decide what I should do?

Should I tell Zach I can't go with him so that my friends might forgive me, or should I just go with him and forget about it?
<bot>: Kind of took the guy my friend wanted to go to prom with. Friends are all pissed at me. Want me to tell him I can't go with him anymore, don't know what to do.