Send this message instead:
"Hey, I'm just curious to see whats going on with us? I had fun with you when we met, and I wouldn't mind getting to know you better."
Do not apologize for things you haven't done for sure. Try to be positive, don't think about breaking up, be confident.
"So if you aren't interested in me, I'd appreciate it if you just told me "
It's good to be direct but don't start assuming she's not interested so early. Get more experience with her.
I have a long time interest in psychology, specializing in relationship dynamics for 30 years.
(Please note, we give the best advice we can based on the information given in a post. For better advice, please include the age of all romantic partners.)