I'm inclined to be in agreement with Mr. Cardinali here.
The bottom line is that you don't "owe" her anything, and you should do whatever makes you happy. But let's look at a few points...
1) It's not about the $124. Like Cesare mentioned, the issue is not about the money. In fact, I'm willing to bet that she's expecting you not to pay, and in a way hoping that you don't. Why? Because then she can have "proof" that you're a jerk and that everything is your fault and not hers. Just like you're painting her to us as a clingy bytch, she wants to paint you to her friends as an assh0le who led her on.
2) She didn't do anything wrong, and neither did you. First of all the chick didn't do anything wrong in liking you so quickly. I mean, isn't that why we're here on this web site, to learn how to get chicks to fall all over themselves for us? She just liked you a bit more than you liked her. And for that you feel guilty, and that's why you're putting her down. It makes you feel bad that she became so attached and that you weren't able to return her sentiments. It's human nature that when someone gives you more than you can give back to them (whether it be emotional or material), you start to resent them and eventually hate them. The thing to remember here is that she is a good person, and that you are a good person. She wasn't bad for liking you too much, and you weren't bad for not being able to return her affections.
3) This is the beginning of a cycle. As you become more and more of a ladies man, this will happen to you more and more. You'll come to realize that women will start having feeling for you more than you have for them. Eventually the guilt of not being able to return the sentiments and breaking so many hearts starts to take its toll on many men, and can leads to cynicism, unhappiness, and in extreme cases depression. So what's the solution? As Cesare so aptly stated, you want to leave every woman better than you had originally found her.
Look at it this way, men such as Casanova, Picasso, and other great seducers of history are admired and adored today not only by men, but also by women. The question is, why in the world would a woman want to be with a Casanova or a Picasso when they know that the romance will last for a short period before Casanova or Picasso broke up with her?
All relationships will eventually end, in one way or another, given enough time. The thing that differentiates the true ladies man from the imposter is in how they END the relationship.
It's almost like two lovers, one whom after having sex immediately puts on his pants and heads for the door, while the other makes a show of resenting the fact that they have to leave. They make walk a few steps and come back to kiss the girl, hating the fact that they have to leave. It's almost like they had to exert all their will power to finally go. Now, both guys left, but with the first guy the girl feels like a cheap wh0re, while with the second she feels like a siren.
That's why women today want a Casanova or a Picasso. They know that the relationship won't last forever, but they know that when the man leaves, he will do so having made them feel more beautiful that Aphrodite.
And the best part is that you can truly take pleasure in being a ladies man. You won't have any guilty associations with it, because you know that every woman you come in contact with is going to become a better person because of you.
So as to what about the tickets? Here's what I would do. Now, please keep in mind that what I'm suggesting is by no means the "right" way or even the "best" way, but rather what is right and best for me.
I would give the roommate the $124. In turn she would give me the tickets. You had mentioned that you would be getting only one ticket for each show, and your ex-chick would get the other. Well, I would take the tickets and give them to the roommate as a gift. I would tell her that your ex-chick spoke very highly of her, and that it would mean a lot to you if she would take the tickets and go with your ex-chick because you know the two of them would have a lot of fun together, and walk away.
This achieves many results. First of all, you could cut the relationship cleanly and move on. Second, you will have a clean conscience, and feel good about being a player. Third, there is no way she can see you as an asswh0le, no matter how much she would like to. Fourth, in time she will come to see you as a good guy, and that things simply didn't work out. Fifth, your reputation will soar. Her friends and acquintances will probably hear of this, and they will think highly of you, and you'll be surprised at how many of them will want to have their chance with you.
Well, this has gotten to be a little longer that I had anticipated, but I hope you find value in it.
Master of the Universe
