Threatening to commit suicide.

Sir/Madam, I am in a relationship since 2 months. But we are knowing each other since 1 yr. 1 week before octane to know that her Ex (lives in UP) calling her, nd crying after her to come back to him.after knowing this matter I let her choose the decision "whatever will be your decision,I will respect her decision". Then she told me she wants to stay with me, nd I've no issue about that. I just told her, "if he continuously call you then you should block him" nd she agree that. But yesterday when she come to my house I saw that her ex is calling nd she also called him on that day when I told her to block him. Then she told me,"the guy is blackmailing her about her innerwear photos in which she sent him on 3 yrs ago, nd he continuously threatening that to come back to him, the guy was not loyal to her, he already committed with other girl during their relationship." So the guy never leave my girlfriend. Always he threatening and blackmailing her. He threatening to commit suicide. He blackmailing her about her photos to send it to her parents. So I suggest her to not pick up his phone, bolck him in all respective ways.. But he continuously threatening her.. Sir/madam please suggest me should I advise her.