Delete and block his number. If and when you see him, walk by and ignore him. Don't even look at him don't wave or answer even if he calls your name or says something mean. Act as if he doesn't exist. Also, now you have the opportunity to find a better boyfriend who will treat you right and understand that sometimes people can't answer a text or call right away. :) The best revenge you can get is showing him he didn't ruin your self esteem. It is revenge enough that you are happy without him and that he could not keep you down. Hold your head high, hang out with and make friends and if you want a boyfriend, get another one. :)