Its sad to hear this kind of story but things like that do happen. Sorry, its her lost and for sure someone better and genuinely faithful will come your way.
If your ex- wife is also from another country (even if she is not from the Philippines), it might affect your future application in the same category. It's already a red flag for USCIS. Once you cleared yourself, you can reapply after the two year period. I've read, a waiver can be an answer if you plan to petition someone again within two years (same category). I'm not sure though. I've read some stories like this from different groups. It sucks, but it does happen. Maybe someone here who personally experienced this can explain further?...
She has been issued a Visa already so you might have to call the US embassy here to get more information on what to do. She can't use the Visa anyway, and it will just expire naturally. If she decides to come here with the intention of marrying another using "your" Visa, (with you not taking action yet), she will just put her self into trouble.
Don't rush into falling in love or commitment. Make yourself "clean" from all the troubles your ex fiance has caused you, both legally and emotionally