Most Helpful Girl
It's different for every girl. Personally, I think that it's interesting that someone would ask.. and I wouldn't mind it so much. HOW they asked, would determine whether or not they're coming off as desperate. If you go "wait wait but why wouldn't you go out with me again?" that's kinda like uhh.. calm down. But if you approached her saying, "I'm not trying to ask you out again or change myself to be what you like, but could you let me know why exactly we didn't work out? Just for my own future references?" some girls might respond well to that, and others might just think it's weird anyways.
THAT BEING SAID. I don't always think it's necessary anyways (unless you're being rejected ALL THE TIME by EVERY SINGLE GIRL) because as cliche as it sounds, just be yourself, and the right person will like you for what you're doing and who you are.0THIS IS NOT RELEVANT ANYMORE