Some background here: She first approached me about going to prom and at the time I was pretty against it because I am not really one for school dances and such. She was pretty upset and said how she really wanted to go with me and such.  About a week later I figured that I should go because that's what couples do and that it wouldn't kill me to go to prom. So last night I tell her and she got all mad me saying how I now want to go to prom with her because now its convenient for me and I tried explaining why I changed my mind but she was still all up in a fit. If I am the asshole here what do I do to fix it?