Most Helpful Guy
Such a reaction is a red flag. @phanindra554plus has a point. He could be a dangerous fellow and you better watch yourself from him. Not contacting him may be even more dangerous as he may overreact even more. It's best you get it to his head that the two of you are finished and that he should move on. If he doesn't then there could be problems (have your dad or some one else be on the ready to intimidate him).