your ex wife can file case of rape against her boy friend . she had sex with him under promise of marriage
2) your ex wife can file police complaint against her boy friend if he threatens to leak video on internet
3) section 67 and 67A of the IT act prohibit the publication and distribution of obscene and sexually explicit material respectively,. Section 66E t deal with punishment for violation of privacy, and explicitly forbids capturing, publishing or transmitting ‘the image of a private area of any person without his or her consent’
4) she can also move court and obtain injunction against her ex boy friend