I screwed up

I don't know what to do with myself. I was seeing a girl, not dating. We had dated for like 4 days but then she said she wanted to take it slow. Ok. I continued to pursue her even though I kinda knew this was gong to end badly. I still hoped. Stupid hope monkey.
So for about 2 weeks I texted her and bought chocolate for her and flowers once. Stuff I never do for anyone and have not done in a couple of years. Still, I did this and she was not my girl. I was hoping. I found myself telling the handful of girls, seven of them, that were trying to get my attention that I was seeing someone, or that I had a girlfriend or that I was just too busy to do anything else but work, which is and was true too. I turned down gals that I could have had for a hope.
This last weekend I went out for the first time in over 2 months to see a friend who wanted to see me. I ran into a girl I knew that I liked but there was never anything there. I directly flirted with her as I always would have in the past and bam! I messed up.
She is close friends with the close friend of the girl I was seeing. I knew this could have been a mistake but I was buzzed and didn't think about it until later. I kinda knew immediately but buzzed me ignored it. I screwed up.
There is more to the story like her talking to her ex for the past week, how I didn't hear from her as much, all he sweetness went away and how I have known for a week that this was probably coming in one way or another. It's just sad that I brought it about. I mean I would have in one way or another anyway. I would have been smothering, not giving her enough space, work too much, not give enough, too flirty (which i know i am natuarally. I need to work on killing that) or I would have given up. It was coming I just hoped I was wrong.
In the end I would like to say she drove me to it, not wanting to commit, talking to the ex, talking to me just enough to be polite friends when I texted. I could have avoided it by talking straight to her and asking, and that probably would have ended it right there.
The thing that kills me is that she thought I was not being honest with her. I did not pursue anyone, date anyone, sleep with anyone, go on a date, buy things for anyone but her. I was not dishonest, I made a bad choice and that was to go out. Had I stayed home none of it would have happened and I knew that I shouldn't have gone to that bar because it is nothing but trouble and it brings a different me out and I know it. I messed up because I went to where I knew I shouldn't. That damned bar. It's not a bad place but I am not good when I am there.