I think I like my best friend more than I should.
In what way do you like your best friend?
More than I like my girlfriend
When it's your best friend you're dating, you have more to lose, since far more is at a stake than just the romantic relationship. You should talk to your current partner about your feelings and try to focus on that relationship first.
I'm going to dump my girlfriend tomorrow and feel good about it.
Do you think that's a good idea? Often when you try to turn a friendship into a relationship it ends terribly.