How do you break up with your girlfriend and still be friends with them?

ok i am going out with this girl who use to be my friend. and this relationship we're in sucks, its boring and i already found another girl. im not going out with the other girl but i want to. so i just wanna know how to break up with my girlfriend and still be friends.How do you break up with your girlfriend and still be friends with them?
I dunno man, just go up and say something like, ';I love you, but I need a break from this relationship, maybe at some point down the road we could possibly go out, but as for now I just wanna remain friends';. I just broke up wit my girlfriend today and I said something that made her run off in tears. I told her this '; I love you, but I dont think I can love you anymore';