Well, I arranged to meet up with her to do some studying and have a chat. She didn't reply, so I asked her if she was interested online. No reply.
Then, she blanked me when I was at Uni with her. She said hi, then just walked off as if I'd never arranged anything.
I got the hint, but even so I felt I should confront her, so I made a point of calling her over rather than just letting her slip away easily. She explained that she was struggling with the number of deadlines, didn't have time, and then disappeared.
The whole "explanation" lasted about 4 seconds. I had to reset all my transport arrangements thanks to the fact that she was apparently incapable of just texting me or calling to say she didn't want to/was too busy/whatever, which annoyed me a lot.
When she "explained", I just laughed. She looked pretty ashamed.
I only just refrained from saying "Thanks for the advanced notice", but I'm glad I did. I don't think it benefits anyone to get crappy with people.
The biggest irony was that about an hour later, once I had travelled back home, she messaged me online to ask about the work we were doing. On the same program where she'd ignored my earlier message asking for confirmation.
She apparently got a poor grade in the last assessment, presumably because she really isn't applying herself as she should be. I was hardly in the mood to offer sympathy. I was thinking about giving her a frank and pretty angry phone call before the messages, but I again resisted.
Instead I told her that perhaps if she was so busy I shouldn't keep her talking. I logged off after that, I think it sent the right message.
I'm not going to bother with her for the next month or so, she's going to get the bare minimum of kindness, nothing more. If she tries to play those intimacy games again, I'm going to take none of it.
That she could be as callous and cold as she was (apparently my feelings aren't worth a free text) surprised me even given her past form. I guess I'm just naive and foolish.
I'm going to concentrate on improving myself now, going to the gym and getting extra activities in. I've bought a guitar and I'm learning how to play it.
She can go whistle until she gets a major attitude change. Maybe she'll realise that she screwed up, maybe not. Either way, I'm considering myself free and totally single now, there is nothing between us anymore in my view.
Thanks again everyone for the help, fingers crossed that I find a girl that gives a hoot about me in future