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

Since January 20th, I have been in a relationship with a girl(19/F), her name being Miranda, who was my best friend for one year before the relationship started. We tried to wingman each other now and then, but eventually started dating each other. She took my v-card. 

Throughout our entire soon-3-month relationship, I have been having some doubts. Do I actually just like her as a close friend? How attracted am I to her? And so on.. 

Before we started dating, I had my eyes on another girl(17/F), Kathryn, from one of my math classes - this girl is really physically attractive, and very nice. I never managed to grow a pair and ask her out, which I talked about with Miranda. At that time, she just told me to ask her out and gave med advice and so on, but I did nothing.

Yesterday, I get a message on facebook from Kathryn asking for help with some maths - this is not the first time she does so I am quite chill about the whole thing. Then, after I have guided her through it, she asks me if I would like to grab a cup of coffee with her. In my head I panicked, and told her "Sure, that sounds nice, I'll find a day when I'm available".

Now here is my issue. I am quite certain I want to break up with Miranda and go after Kathryn, but I also want her to stay my friend, and since she knows about my attraction towards Kathryn, do you think it might hurt her if I get in a relationship with this girl after dropping her? This is my very first relationship with a girl and it has been short, and I am not very socially intelligent.
<bot>: Been in my first relationship with a girl who was my best friend before the relationship, I have had my doubts, and now a girl I never had the courage to ask out, asked me out