i think this new girl does like you. generally if a girl doesnt like a guy she wouldnt give him her number or talk to him a lot. keep talking to her and getting to know her. never think that you dont have a chance. have confidence that it could turn into something.
how to move on from your ex? well, its gonna take time. its not going to happen over night. however you are on the right track. stay strong and resist the urge to text or call her. shes being immature by spreading rumors about you. just ignore it, and dont send angry text messages to her. maybe thats what she wants, to know that she still has an affect on you. ya know what i mean? sorry if thats confusing. just ignore it and dont get wrapped up in the drama, it will help you move on.
you could join a club at school, or a sport. maybe get into a hobby or just go out with your friends more. you may not have really close friends, but if you spend more time with them you can get closer to them. ask this new girl out maybe? dont dwell on the things that arent going good, remember that it wont be like this forever and look forward to the good things.
hope this helped