So there's this girl from work who wanted to hang last night, and I was not at all in the mood to chill by the time night hit because she's just too far away. I thought other people were going to be at her house (other girls from work were talkign about going), didn't realize she was alone. Woke up to an angry as hell text from her saying she blew off her good plans to hang with me. The worst part is, I don't really care because she's not really my friend. How do I approach this and not seem like a giant bum?