Ok 'thecatfish111' I won't directly comment on your gaming as 'damrini' and 'blondguy' have already done a good job but I'll add to it for you and everyone else...
Girls with BF's are problematic, especially if they see they are getting male attention from another guy. Some girls might ignore your attention but some might be bored of there relationship, not enough to break up, so they'll mess around with you.
The main mistake I see you made, was to be too available.. You should have distanced yourself from her and become a prize that she wants. I know this from personal experience myself, it kinda happened to me the other day but I didn't falter, if your interested read my post.
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Girls have choice, they have even more choice if they have a BF, so don't ever give her the choice of being with you or her BF.
eg. don't say 'it's me or him...'
Just be cool, distant, if she on the phone to you say you've got an important call on the other line, tell her you'll call her back and don't. If she texts you ask who it is as if you don't have her number saved. Same goes for if she calls/emails.
You must never ever put yourself in a position where you are seeking physical attention from her. It must be the other way around she must seek it from you otherwise you are too available and in effect a choice..
Good luck, if I were you, if you go back don't tell her your in town.. Let her find out from a friend. If you see her, be cool, calm and ask her how her BF is? Talk to her about him. Then this what I would do if you meet her in a club/bar...
I quote justin bobby (the hills)
You: Is he a nice guy? (about her BF)
Her: Yes
You:Yer?! He pulls the chair out for you, hold the door, and buys you a drink?
Her: Yer he does
You: Wow.. Sounds like a nice guy..
Her: Yer (awkward)
You: Such a nice guy he's not even here! Wish I could have met the old nice chap..
Her: yer.. (you've completely made her BF sound like a nice/boring guy)
You: Sounds like a keeper dude.. (cheeky smile, eyebrow raised)
Make sure you're leaning back in an alpha pose. Sip your drink and look around at other people in the club.
Good luck
TC