<human>: Can you provide a brief overview of the text?

Basically I've been seeing this girl for about three months now. Although we never said we were exclusive, it was highly inferred and this is pretty out of norm for her. She has been acting distant for the past week, but said it was because of schoolwork. I also have been flooded the past week so it was not too much of a stretch. 

Today when I asked what her plans were she said she was going to a fraternity formal tonight with a guy. Now while I have no problem with this, especially since it was probably planned before we started hanging out, what worries me is that she decided to tell me the day of, over text. Combine that with her distance this last week and I'm not really sure how to approach the situation. I texted her back that she could have told me in person, but there was no response.
<bot>: Girl who I'm dating(?) decided to tell me that she was going to a fraternity formal with some other guy the day of, over text message after being distant for a week.