Breaking up with your current girlfriend won't do anything.
You'll eventually want her back, every single time.
At the moment, other girls might seem more intresting.. like your "home girl" but.. she'll never be like the one you are currently dating.
You are an indecisive person, and you are probably scared of commiment, which is why you are so flirty.
If your anything like me, you probably don't want to be alone either.
You obviosily like this girl alot more than you think since, you found a forum site about relationships, just to ask what you should do with her.
For the people that said "stop being flirty. It's that easy" No. Actually its not.
It probably became a habit which you have to get rid of. If you seriously want a commiment, your going to have to use that flirty energy on something else. Like a sport, and such.
Find something to get your mind off girls.
If she really is the one you love, then your going to have to change.