Will he ever let her go?

My husbend and i got married a year and a half ago and his ex who i have asked him not to talk to keeps calling and brings us to the brink of divorce everytime. we have had this issue from the beginning of our relationship she keeps calling and now is asking him to be her pimp! am i wrong for wanting to leave him? Its been six years and he still hasnt let her got will he ever ? please real answers only im really in a bind. will he ever change?