Okay, you seem to very confused about the whole thing. Your single...Your supposedly a guy....a girl is giving you signals....geez, that's a no brainer if you ask me. Okay, if you are trying to get back with your ex....it most likely will ruin your chances. If not, then why not take the chance and date this other girl. At least get what most guys want from her. Do the 4 "F's". As my older brother says it..."Go with the force!"