Help!!!

I’ll make the long story short.

My sister told me she is getting a divorce from her husband because she has heard from his uncle that he found a way to divorce her without her knowing and that he has someone else and that he is tapping her phone and maybe has a gps on her car.

So she also told me that my husband knows about it and I don’t know what to do should I confront him and ask him why he doesn’t tell me?? Or should I leave it alone I feel really bad because my sister is going through this. Please ladies help me what should I do?