<human>: Last February I (19m) met a nice girl (19f) and didn't think much of it for a few months.  We started talking more and more and to make a long story short I asked her to lunch in mid April, she said yes, everything goes well.  A week later we I ask her to dinner, she says yes, everything goes well.  Two weeks after this we make plans to go get dinner and see a movie but that turns into lunch and a movie due to it being finals week at our university.  

A few days after this I met her again, said goodbye, and moved back home for the summer.  We texted a couple times a week and called a few times over summer, and I visited (I have family that lives in the same town as she does) twice and both times we were able to meet up one on one and we also hung out with some mutual friends.  

So fast forward again to last week, I move back for school and we end up getting lunch on Sunday (logistically lunch worked out the best) and afterwards she said thanks for lunch and that she had a great time.

At this point, I'd like to try to move this from a casual dating thing to an actual "relationship", but how do I ask her?  I really didn't date much in high school (there wasn't anyone I was very interested in in my home town) so I'm pretty much clueless.  It might also be worthy to note that I've had suspicions that I'm in the "friend-zone", mainly due to the fact that I was gone for three months, but nothing in her actions hints at this.

Can you give me a shortened version of the text?
<bot>: Started dating a girl a month before school ended, everything went great, stayed in touch over summer, I moved back to school and things still seem the same as before, how do I ask her if she wants to become exclusive?