How do I break up with a girl and still be friends?

My girlfriend and I had broken up and I started seeing other people, and I met a nice girl that I liked. We had been on some dates, nothing serious. I ended up getting back with my girlfriend today and I'd still like to be friends with this girl. Thoughts, suggestions?How do I break up with a girl and still be friends?
say this, ';Hey, can we talk?. . . Look, you're a great girl with great traits. But I don't think this is working out. I honestly like another girl and I'd be dishonest if I tried to keep this going. I'm sorry if I hurt you now, but I would never want to hurt you worse later and lie to you. I want to be your friend and I don't want you to hate me.';