I know exactly how you feel ...
I put up with the same thing for 3 years .. Secret msg on FB emails ohh & the phone put on silent . I wasn't allowed to comment on his FB & he changed all his passwords because she told he's an adult & he can do what ever he likes??
She convinced him to ignore his family,,
I started to loose my self respect & told him that he either deletes her or the marriage is over?? This was 4 weeks before our 20th wedding anniversary ... He choose Her on FB????
We have been separated for 1 year now sold the family home & he is now living by himself a very lonely man.
Now he wishes he could go back & change everything but you can't go back once you loose trust..
I went with my gut feelings all the way & was right, I'm very lucky to have wonderful friends that support me but can honestly say that I'm happy I didn't let them distort me xoxoxo