@FLClover What an absolute shit he was - I can believe that, even though you've moved on, it would still be simmering.
@nix What others have said is absolutely right - she could just be in a panicky denial - it's hard to know how people will react. Some people come through completely unexpectedly while others you thought would be supportive, disappear. She may make a definitive move either way when you know what's going on but importantly, you must focus on yourself. I'm not going to give anyone relationship advice but you need to call it as what you can live with, although if it was me, I wouldn't be rushing to confront. It may be just that she needs time to process what's going on. In the meantime, I hope that you have other supports in family and friends.