Please, at least one answer?? why is my ex doing this??!?

You know what! Throw him in the back of your mind. Make sure not to think about him until he does something really incredible to get you back... if you get back together with him, it will be weird and never the same. You will reconize why you should do this! If you ask him out, he will think he has something over you, or that he can control you. There is just somehting about some "men" that says,"I'm not looking for love, I'm looking for power". So the thing you have to know is that a year is not long enough! Love happens at it's own rate. You don't get back together with him until he proves he belongs with you! Anymore "rumors" about him dating other people, date that other dude at your new school! Maybe he will treat you better and realize how you can benifit each other. Good luck... have a good life (that last part was to your ex!)