There's a girl (HB8) who I've been seeing slightly for a while at university (were both Freshers), although we haven't even kissed yet, mainly because I hadn't had and opportunity to see her alone. I finally get her out to dinner, we have a really good time, although she keeps saying that I'm a bit of a womanizer and need to settle down etc etc agree to meet up later in a club, I get stuck in the queue, and by the time I get in, she gave up looking for me apparently, and I run right into her making out with a guy I know, who she apparently thought I was trying to set her up with.

We were both quite drunk, and I got quite despondent and sat down on a couch, and she kept coming up and saying "whats wrong, cheer up, etc etc" until I eventually blurted out that I really liked her (stupid I know) and she just looked really taken aback and just said that she had no idea how I felt, etc etc. Now the thing is, since finding out about the game, I've been getting fairly successful, and my aforementioned catastrophic error was to basically, during the other times I spoke to her, tell her about the successes I have been having.
She said shed text me today, and I get a text saying.
""I don't know what to say - I genuinely thought you wouldn't get with loads of people/ tell me about it if you did like me."
She was originally giving me tons of IOIS, but I think that she figured I wasn't interested, but the other guy I know, who I introduced her to, started making contact with her. She said to me, a little while after I introduced him, "oh hes cute, can you get me his number" which I figured was just a shit test. However, after he contacted her, she thought I was trying to set them up. Did she just figure "oh hes not interested, so hes trying to set me up with his mate instead?"

Put shortly, I haven't been LFBF'd yet, but I have no idea what to do in this situation. I actually want to date this girl btw.

first of all your falling into the classic pitfall of listening to her words rather then paying more attention to what she is doing. Forget all the nonsense she is telling you. We can assume she has some level of interest in you, probably low-medium, or she wouldn't be fucking with you at all.

Based on those basic truisms just game her as you would any chick and ignore what shes telling you. The fact that you really like her is not going to help you at all so keep it to yourself.

I would tell her about how much fun your having, and how all these girls are after you but your picky, and when she wants details be mysterious but make it subtle your getting plenty of grade A trim while still trying to "find your soul mate." Establish credibility, create intrigue blah blah blah. And considering your prior needy behavior only return the same or less attention that she gives you.

I agree with detox75, she liked you when you were showing off and being cool as you had a good time at dinner even though she called you a womanizer (which is actually an IOI).

Pretend you never said you like her, act like "whatever" when she's around and treat her like a long time friend, now that she loses your attention she should try to get it back by teasing you and you can go back to act like before.

About the other guy act as if it's really cool what she did, be interested if you talk about it and treat her like a friend sharing some of your stories with other girls too.