Dating bizarre..help!!?

It sounds like she and the bartender have become closer...close enough for this talk to occur. She was very quick to just dump you, without wanting to know more about what happened. I would guess that she is just using your 'screw up' to set herself free again to date someone else...the bartender. Sorry, but I would advice you to cut your losses and move on. If after a period of time, there doesn't seem to be any romance going on with him, or anyone else, you can approach her to explain your side. But if her mind still seems made up, there is little you can do.