<human>: Have been dating a girl for three months now. Everything has been going great and we usually see each other three times a week. I asked her earlier this week if she was dating/seeing anyone else since we never really had that talk and we both said we weren't. 

She told me she was going out with an old girlfriend tonight for some drinks at a local bar in Atlanta. Last night I was at her place her phone was sitting right next to me on the bed. A message popped up that said "still on for drinks on Saturday?" from a guy. 

She texted me earlier in the evening and was responding back and forth almost instantly for about 5 minutes then absolutely nothing. I know I can't really be mad since we haven't had the exclusive talk and what not but I literally have no idea how to approach the situation or if/how I should bring it up. We are supposed to get together tomorrow to finish up some last minute Christmas shopping. Anyone have any suggestions or input if I should bring this up tomorrow or maybe wait until after the holidays? What should I even say?

Can you provide a brief overview of the text?
<bot>: Been seeing someone for three months now. She said she wasn't dating anyone else, signs point to she is. Not sure how to approach.