Stay strong ....you broke up with him for a reason... Don't call him... It makes you look desperate...good luck
No. You shouldnt call him go look for other guys.....but if you want to call him.tell him that you are going to be just friends .if that what you want.
If it was your fault that your broke up then by all means phone and apologise - but it doesn't mean you will get him back. If he broke up with you then leave it and make other arrangements.