<human>: I've been seeing this girl (she's 19, i'm 20) for about two months. It started out in school as a hook up scenario, but it progressed into a casual dating scenario after a bit. Things were going really well during school, but then the summer hit. I really like this girl and was trying to pursue a relationship, but just tonight I called her to talk about something and she brought up kind of out of nowhere how she wasn't currently looking for a serious relationship and she wanted to keep it casual. We talked a bit about our summer plans and hanging out in the future but honestly I was kind of stunned at this point and I don't really remember what I said. 

I'm really at a loss for what to do. I really like this girl and think she's really special but I'm just really confused right now. She had been giving me nothing but the most positive signals during school, but I haven't seen her as much since school let out. I don't really know what she meant by keeping it casual at all. Does she mean just for the summer because she's going to be busy? Is she trying to cut things off? Why the hell did she tell me this in a shitty circumstance over the phone and not in person? I'm really upset by this and I need some guidance.

I feel like I need to talk to her in person but I don't know what my protocol should be about initiating communication with her after this or asking her to hang out. Also, I don't even know what to say to her. 

Can anybody help me out?

Give me the gist of the text in a nutshell
<bot>: Really into this girl, she dropped a bomb on me and said she wants to keep it casual and I don't really know what that means