If you like the person, then don't end the relationship. It's quite simple. If you like someone else, just tell the person you want to break up/not get together (confused if your dating a person or not). It might be hard at first, but you'll both get over it. Then go for the other person and if you come out short, look for someone else/go back to the first person. Just remember, the average person dates 7 people before they find the right one. I agree with everything you said, except the going back to the old gf. No girl wants to know she's second best. And what kind of a guy are you if you say "O. I fail, I'll go back to what I know is easy" that's crap. If you fail with the new one, find someone else, don't put the old gf through that. :