Just wanted to throw out a couple options regarding Snapchat. I agree you can't control her to remove it, but maybe if you asked if she would be willing to uninstall it for just a couple months, to give you more time to heal and you guys to continue to strengthen your R? Alternately (or if that doesn't fly), what if *you* installed Snapchat and started using it and encouraging her to Snapchat you?
I get your concerns, but if it's something you have to learn to live with, using it with her might help you see it as more of a neutral communication tool and less of a dangerous affair-facilitator.
Me, WW - Upper 30s BD - Apr 1 2016 EA - Apr 7 2016 (discovered; ongoing for months; did not confront right away) Confronted wife about EA - May 17 Wife sent NC email to OM - July 11