Most Helpful Guy
report him and let your friends, neighbors, family members and other people you trust know about the situation.. they can help keep an eye out for your ex, and call the police if they think something is wrong or something suspicious around where you live while you're gone or sleep.
don't forget... unfriend other mutual friends, especially if you are concerned that your ex will use them to track you.
don't be scared, that's what your ex wants... see you scared.
Most Helpful Girl
First report him again. Ask for help. Don't open the door, nor accept his calls, try to not tell much about your life to your mother since she will pass the information to him. Don't show him that you're scared even if you are. Be strong! And ask for help