Why won't my boyfriend block his ex girlfriends number?

Anonymous
Me and my boyfriend have been dating for over a year and recently his ex girlfriend, who is a bit on the crazy side, has been texting him a lot and if he doesn't respond ( he never does from that he tell me) she calls him alot. I'm starting to get annoyed, I told him to block her number since he says he doesn't talk to her, that was a while ago and she is texting him more and more. She tells him to come over and calls him babe. I'm not sure what to think or do. Oh if it helps their relationship was terrible they fought all the time and she did drugs and got drunk all the time.
Why won't my boyfriend block his ex girlfriends number?
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