I'm not sure I understand the argument over social media. However, I think you need to stay away from always "stressing" to her that you are not comfortable with OM having access (or whatever it was). I don't think she is going to stop it. You have expressed your feelings about this several times and she chooses to not do what you've asked. So.........why continue doing what doesn't work?
Actually it was her argument, I was upset about it, she knew I was and approached me. I had simply come home and went straight to the room (I shoulda at least said hi, but I didn't want to talk to her at that moment), she came into the room and started laying out her reasons why it doesn't mean anything, yada yada... I didn't lose my cool, but she did, I simply explained why I didn't like it. Eventually she did block him, but it frustrates me that she doesn't see why it would matter to me.
On a brighter note, I am starting to let triggers go without feeling the need to discuss or question her about every one of them. I want to identify the little things that trigger me, wait until I have enough of them to figure out what the real issue is and then maybe discuss the bigger picture, instead of each individual circumstance.
M - 9 1/2 years 5/5/16 - Bomb drop - 3 week EA 10/31/16 - We sold house 01/10/18 - D Finalized