If egf was the one she talked to about OM, you can probably be pretty certain that is what she was texting to her.....about the latest developments about him. Egf was the one that she confided in about everything. She wouldn't talk to you about it because it would be hurtful.
I'm afraid you are going to "blow". I think it is time to say something. She needs to start working on the marriage if she wants to be with you. Going day to day with no remorse is not going to help. Building the foundation for your marriage to build on will have to start with trust and forgiveness. She is going to have to give you something in that way or I see you just giving up.
Don't give up. Your marriage didn't get bad in a short period of time, and it won't get better in a short period of time. (Except you would get a very good shove if you went to retrovaille)