How should I handle my fiance's ex girlfriend?

He was with her for 4 years, then she cheated on him twice, and he left her. He got on with his life and met me, naturally we became friends, partners in crime and finally lovers and now soulmates.

She's been giving him hell ever since he proposed to me. Even disrespected me several times whenever they talk. She textes him in the morning in the afternoon to a point where he (even after he told her to quit it and she didn't) he had to delete her off his facebook. As for his family? well they seem to like her more than me ( going out with her, inviting her to parties where I would be, letting her disrespect me ETC)...and have shown it several times, except for his mother.

A couple of days ago I was getting the mail and he received an anonymous brown box. I texted him to tell him, and he told me to open it. She had sent several pictures of herself naked (completely pornographic and exposed ) to him and a DVD in anger i told him, he came home and put the DVD in the T.V it was a video in which she was pleasuring herself and asking questions such as "would she do this for you" ETC ETC. He got insanely mad and offended and went to take care of it. As for me, what should I do?