My girlfriend is really wild and all over the place and i dont know what to do. tell me what to do?

Ok several months ago i met this girl she came and knocked on my door and asked if i wanted to go to the bar with her we went to the bar we had later that night on the first time we met and ever since then things have been getting crazy. Everything was cool at first because i just thought of her as a crazy wild girl that just wanted to come around and bone, but after a couple of weeks after all the hot ponate moments i started to fall for her and asked her to be my girlfriend. Then everything was cool for a while but after a while i just started to dislike her habits. she has all these girl and guy friends and her phone is ringing every day with calls about shows, concerts, partys, clubs, music festivals, and all this crazy stuff that happens all most every day. She doesn't work a job shes sorta big, i mean not huge but i would say shes a little fat and a little ugly. she will leave out of town all weekend to go to some music festivals. Sometimes she goes and records music with a bunch of guys who are "just friends" and they are always at these music festivals that last several days and all these concerts and events that she goes to. She is going to school for the bussiness of music and she wants to be a band manager so she uses this as a excuse to go to shows and concerts and festivals and smile and flirt with every guy that talks to her so she can make connects. sometimes she goes out and never comes home and says shes at a friends house and doesnt bother to call me or anything to let me know where shes sleeping that night. I know i can do better than her and find a respectable nice pretty girl that wouldnt be out all the time like this but im really like her then she totally blows me off for her friends i tell her we should break up, she gets upset and we stay together and the same beavior continues. I have broke up with her twice and she says she really likes me and wants to be with me but she really does what ever she wants to. I work nights and im off two nights a week and i like to spend at least one of those with her but last night was her last night before she goes to a music festival for the weekend and i had to get into a big arguement with her just to let me hangout because er friends kept calling her then we did and had a good time at the first two bars we went to then we went to a club and the bouncer said i wasnt dressed cly enough and i pulled her aside and said that the bouncer just insulted me and we should go then she gave me her car keys and went into the club any way. I waited about 35 minutes in her car and she came out. I would expect a decent girlfriend to call her girlfriend in the club and say she couldn't come isnt that what a decent girlfriend should do in that situation? I am really attached to her and i dont want to lose her but i dont want a relationship like this i want trust in it and i want to give her every oppurtunity to show me that i can and i should but she keeps doing the same stuff. i told her what i expected from this I expect that she has no more than two nights out with friends a week, let me know where she is sleeping just a quick text or something and no more music festivals unless she takes me with her i would think that is more than enough freedom. she had with one person i know and did other stuff with another girl i know before we ever met so trust is hard. She is talking to all kinds of guys on the internet facebook and is asking them what their plans are for later this week or whatever and when i ask her about it she says its a promoter for some events and she was asking about that or talking to a band member friend who she makes music with or something like that. Should i just let go emotionally or break up with her because its obdvious this behavior isnt going to change or just have and not get to attached. I have alot going on for me im an attractive guy great in bed Im about to finish 4 year school in a month or two. I have two jobs a good running vehicle my own place money in the bank and a boat. Maybe I should just shoot for a really attractive girl insted of an ok girl who has a decent car isnt all over the place a job ...etc I feel like im settling for something less than what i deserve and id like her to change some and id be happy but i just dont know. Maybe I should just go after that girl id love to be with and has everything im looking for. But it would really hurt to let her go. What should i do?