How do you get rid of an annoying ex boyfriend when he is trying to get you to like him again?

Have a firm conversation with him. Do it face to face, not on the phone or social media/text. Tell him that you do not like him in any way, shape or form. Sometimes the "I like you as a friend" is NOT enough for men or women who seem to be holding on too tight to a relationship that was "one sided".

If he is one of those people, you must, as stated, tell him firmly and without mincing Words that you have moved on, that you do not like him and that a relationship with him is NEVER going to be in the cards.

If he does not accept this, than you must have someone else talk to him- such as a friend of his or even your parents! (My Father was great at swatting the "hanger ons" away.)

Sometimes the person needs time, and if they are not bothering you, than give that time to them to move forward with their life.

However, if they are following you, making you nervous, or unable to accept that you are never going to be a couple again - then you might need to take more drastic steps to MAKE him understand. This may include a restraining order, and if you are being made to feel "strange" with his constant attention, phone calls, visits, messages through friends/family- then you might need to tell him that if he does not stop, then you WILL take those steps.

You did not indicate that he was acting any more than simply in denial about the relationship being over, so I am assuming a firm conversation is in order.