Maybe a re-iteration of how the ema made you feel and how you won't tolerate it again?
Kind of a thin line.. could be nothing, could be something.
No offense, but as for OM.. dude.. the cell company can EASILY unlock a phone. New SIM card.. reprogram.. whatever. As excuses go, that's a bad one.
Have you guys discussed the trust issues that go with EMA's in counseling? She needs to be aware what the triggers could be which would include ANY contact to or from OM. Maybe bring that up in counseling.. you know "I'm not upset, just bothered by the situation.. brings back painful thoughts.. etc etc"
Hopefully the counselor will help you guys through it.