I'm sorry this happened to you, but stop feeling embarrassed. Your ex-boyfriend was trained from birth to be manipulative, because he was and now is in a cult. As tempting as it may be to either stay friends with him or report his behavior to the elders, please don't. Both options will just cause continued grief for you. Cut him out of your life. If, by some chance, he leaves the cult, do not go back into a relationship with him unless he has had extensive counseling under the direction of a cult expert such as Stephen Hassan, Randy Watters, etc.
It usually takes years for an ex-jw to cope with the Watch Tower's psychological damage. Although most eventually come through it just fine, there are a few who go off the deep end and become dangerous people.