Why is he acting like this??!!!!?

he sounds possesive. he ended, you're a free woman. what you do now is none of his bussiness. after a break up it's a good idea to take a period of time where you stop all contact with the person. you need to stay away from your ex for a while, live your life, and not let him be a part of it. worry about attepting a friendship at a later date. good luck.