Hold up..you say you're about to break up with your gf that you've been goin out with for 2 months and you're confidence is going down? I don't really understand that. If anything, it'd go up. You've proven that you can live without her and that there are more fish in the sea.
That's beside the point..Confidence isn't a series of techniques and can't be turned on and off for convenience. It has to be natural and ONLY natural. No longer do you have to think before you walk down the halls at school with your head up and your shoulders back. No longer do you have to think about it before you reach out and gently grab that girl on the shoulder before you start talking to her, and above all, no longer do you have to worry about women! The Bible has lots of amazing articles from the greats. Read up man, and good luck :]