What does it mean when girls say...

look bro,it is not ur mistake, even the god could not understand this girs than how can you. but don't take such things on heart and simply talk to them and try to know them.if possible go on date with them.after a while when you know each other well u can ask her that what she think about u, just a friend or somebody more than this.or u can propose her also if she say "no" it means "next one".

I'm not sure exactly but i'd say that she was saying it just because she thinks your cute, and maybe if she didn't have a boyfriend that she might like to date you. In otherwords you have bad timing :/

Usually girls will make comments like this because they want to test how much you like them. But it is at least worth a try. Some girls might just play with you, but there are others that would seriously think about a possible relationship with you.

its really difficult to understand girls

It means she is un happy with her present boy friend... and you should try harder...